F

F for Flash

abbreviation / acronyms	Term	Definition
FA	Foreign Agent	Node in a mobile IP network that enables roamed users to register on the foreign network. The FA will communicate with the HA (Home Agent) to enable IP datagrams to be transferred between the home network and the roamed user on the foreign network
FACCH	Fast Associated Control Channel	the channel derived by preempting information in a traffic channel. It is used to send handoff and similar messages.
FAN	File Area Network	A File Area Network (FAN) enhances standard network and storage infrastructure. FAN technology provides centralized, heterogeneous, and enterprise-wide network file management and control.
FAQ	Frequently Asked Questions	Most Internet sites and many ISP areas will have a "FAQ" section to explain what is in the area and how to use its features. While many FAQ areas are true compilations of users' questions, some are attempts at anticipated questions.
FAR	false acceptance rate	one of the most important specifications in any biometric system, is defined as the percentage of identification instances in which false acceptance occurs. This can be expressed as a probability.
FARE	Film Automatic Retouching and Enhancement	Canon film scanner technology
FASS	Fast Access Station Switching	a concept in the WiMAX network, is a method by which an MS can change its access station from frame to frame depending on the station selection mechanism.
FAST	Federation Against Software Theft File And Settings Transfer	A European vendor organization concerned with preventing piracy and other forms of unauthorized software usage. The FAST wizard helps you transfer files in windows XP
FAT	file allocation table	An index for mapping logical files to physical locations on a disk storage device. Each FAT entry is 16- or 32-bits long (depending on whether it is FAT16 or FAT32).
favicon	favorites icon	A small image or icon used by most recent web browsers (Internet Explorer 5 and above). It can be displayed in a number of different places depending on which browser you're using.
FAW	Frame Alignment Word	a unique digital word used by codecs to allow them to resynchronize to the framing structure in the event of errors.
FAX	FACSimile	FACSimile
FBA	fixed-block architecture	An architecture for a logical device that specifies the format of and access mechanisms for the logical data units on the device. The logical data unit is a block.
FBD	Fully Buffered DIMM	Fully Buffered DIMM (or FB-DIMM) is a memory technology which can be used to increase reliability, speed and density of memory systems. Conventionally, data lines from the memory controller have to be connected to data lines in every DRAM module.
FBGA	Fine-pitch Ball Grid Array	FBGA is a chip-scale package option for AMD flash devices.
FBSS	Fast Base Station Switching	defined in the IEEE 802.16-2005 (mobile WiMAX) network, is a method to allow switching between any type of access stations
FC / FCS	Fibre Channel (Standard)	The Fibre Channel Standard (FCS) [1] defines a high-speed data transfer interface that can be used to connect together workstations, mainframes, supercomputers, storage devices and displays.
FC-AL	Fibre Channel Arbitrated Loop	A ring-style network topology comprising 125 nodes, usually configured as a double loop to protect the system against device failure.
FCC	Federal Communications Commission	the agency of the U.S. government that regulates all equipment that produces radio-frequency signals, including computers. http://www.fcc.gov
FCCH	Frequency Correction Channel	the logical channel in GSM systems used to transmit a frequency correction data burst of all "zeros". The resulting frequency shift seen by the mobile is then used for frequency correction.
FCD	Floating car data or floating cellular data	a method to determine the traffic speed on the road network.
FCH	Frame Control Header	a field in the IEEE802.16-2004 WIMAX protocol. The FCH specifies the burst profile and the length of one or more DL bursts that immediately follow the FCH.
FCIP	Fibre Channel over Internet Protocol	FCIP mechanisms enable the transmission of Fibre Channel (FC) information by tunneling data between SAN facilities over IP networks; this capacity facilitates data sharing over a geographically distributed enterprise
FCL	Framework Class Library	A collection of classes which are part of Microsoft's .NET platform
FCoE	Fibre Channel over Ethernet	FCoE is a proposed standard designed to enable Fibre Channel communications to run directly over Ethernet. Thus, FCoE makes it possible to move Fibre Channel traffic across existing high-speed Ethernet infrastructures and extend the reach and capability of storage area networks (SANs). This ability allows organizations to protect and extend existing investments in their storage networks.
FCP	Fibre Channel Protocol	he serial SCSI command protocol used on Fibre Channel networks.
FCPGA	Flip Chip Pin Grid Array	the package of certain Intel Celeron, Pentium III, and Pentium 4 microprocessors. FC-PGA processors fit into Socket 370 or Socket 478 motherboard sockets.
FCS	Fluorescence Correlation Spectroscopy Frame Check Sequence	a single-molecule detection technique for high-sensitivity measurement of molecular interactions. Unique features of FCS measurements make it ideal for use in assaying techniques. Any mathematical formula that derives numeric value based on bit pattern of transmitted block of information and uses that value at receiving end to determine existence of any transmission errors.
FCSI	Fibre Channel Systems Initiative	formed by Hewlett-Packard, IBM, and Sun in 1993.
FDD	Frequency Division Duplex	used in cellular communication systems such as GSM, is a radio technology using a paired spectrum.
FDDI	Fiber Distributed Data Interface	A standard for transmitting data on optical fiber cables at a rate of around 100,000,000 bits-per-second (10 times as fast as 10-BaseTEthernet, about twice as fast as T-3).
FDE	Full-disk encryption	FDE is encryption at the hardware level. FDE works by automatically converting data on a hard drive into a form that cannot be understood by anyone who doesn’t have the key to “undo” the conversion. Without the proper authentication key, even if the hard drive is removed and placed in another machine, the data remains inaccessible.
FDM	Feature Download Management Frequency Division Multiplexing fused deposition modeling	An ADSI protocol that enables a number of alternative key and screen overlays to be stored in an ADSI telephone and to be selected by predetermined events at the telephone. Method by which the available transmission frequency range is divided into narrower bands; each of these bands is used for a separate channel. This allows several signals to be sent over the same transmission medium. HP Designjet 3D printers employ Stratasys' patented FDM technology
FDS	Fraud Detection System	VeriSign's product, acquired by Symantec in the middle of 2010
FDX	Full Duplex	Simultaneous two-way communication path.
FE	Fast Ethernet field engineer	An extension of the IEEE's 802.3 standard — IEEE 802.3u — supporting 100-Mbps data rates instead of 10 Mbps, and using 100Base-T or 100Base-F families of cabling standards An engineer who works on-site (i.e., "in the field").
FEC	Fast Etherchannel	A proprietary technology developed by Cisco that creates a team of two to four 10/100 Ethernet adapters or ports to increase transmission and reception throughput.
FEC	Forward Error Correction	Sending redundant data so that if data loss occurs, data recovery is possible without retransmission
FECN	Forward Explicit Congestion Notification	A bit sent by a frame relay network to notify an interface device (DTE) that congestion avoidance procedures should be initiated by the receiving device
FEFO	First Ended, First Out	A message ordering in which, among messages of the same priority level, the messages which are finished first will be transmitted first.
FEMA	Failure mode and effects analysis	provide an analytical approach, when dealing with potential failure modes and their associated causes.
FEP	Front-End Processor	telephony and computer term. A FEP communications computer associated with a host computer that manages the lines and routing of data through the network.
FER	Frame Erasure/Error Rate	a measure of the number of frames of data that contained errors and could not be processed. FER is usually expressed as a percentage or exponent.
FERPA	Family Educational Rights and Privacy Act	federal legislation in the US that protects the privacy of students' PII. The act applies to all educational institutions that receive federal funds.
FET	field effect transistor	A transistor in which the current between a source terminal and a drain terminal is controlled by a variable electric field.
FEXT	Far End Cross Talk	This is a term used in network cable troubleshooting. It is a displayed symptom of electrons traveling the network and bouncing around there for lack of anywhere else to go.
FFD	Flicker Free Display	A computer screen that has a fast enough refresh rate that no flicker can be detected; this kind of display is easier on the eyes.
FFPF	fairly fast packet filter	an alternative platform for network monitoring under Linux. It is a stream-based networking subsystem for Linux that spans from hardware to userspace to offer high-speed communication paths to all applications.
FFT	Fast Fourier Transform	an efficient algorithm to compute the discrete Fourier transform (DFT) and its inverse. FFTs are of great importance to a wide variety of applications, from digital signal processing to solving partial differential equations to algorithms for quickly multiplying large integers.
FGA/B/C/D	feature group A/B/C/D	The different types and qualities of public switched network connection between local telephone companies and long distance companies.
FHS	Fan Heat-Sink	Fan Heat-Sink, see also HSF.
FHSS	Frequency Hopped Spread Spectrum	a spread-spectrum method of transmitting signals by rapidly switching a carrier among many frequency channels, using a pseudorandom sequence known to both transmitter and receiver. It is used in WLAN 802.11 physical layer.
FICON	Fiber Connection	IBM's fiber optic channel technology that extends the capabilities of its previous fiber optic channel standard, ESCON.
FIDNET	Federal Intrusion Detection Network	extensive computer monitoring system, developed by the Federal Bureau of Investigation (FBI), to protect U.S. government and private data networks from being attacked by terrorists or hostile foreign governments.
FIFO	first in, first out	A network queuing method, wherein data packets are dealt with in a simple queue on a first-come, first-served basis. No packets are given preferential treatment; all are queued in the order in which they are received.
FIGS	Figures Shift	A control character used in the Baudot Code to enable the printing of symbols and numbers by actually allowing a physical shift of the carriage.
FIM	federated identity management	an arrangement that can be made among multiple enterprises that lets subscribers use the same identification data to obtain access to the networks of all enterprises in the group. The use of such a system is sometimes called identity federation.
FINDDEST	Find Destination	An internal service in IMS used for finding certain IMS resources, most of which represent IMS destinations. For searches other than CVBs and CCBs, if the block is not found, then if requested, a search for an LU 6.2 descriptor is made.
FINRA	Financial Industry Regulatory Authority	an association that regulates its members through the adoption and enforcement of rules and regulations governing business conduct of member firms. www.finra.org
FiOS	Fiber Optic Service	FiOS is a data communications service provided by Verizon that uses fiber optic cables to transfer data. FiOS is called a "Fiber to the Premises," or FTTP service, since it brings fiber optic data transmission to residential homes as well as businesses.
FIPS	Federal Information Processing Standards	Standards that are publicly recognized by the U.S. Federal Government; also for use by non-government agencies and contractors.
FIR	Finite Impulse Response	a technique used to characterize electrical circuits and　networks in the time domain.
FIRST	Forum of Incident Response and Security Teams	A nonprofit volunteer group whose goal is to foster cooperation and coordination in incident prevention across diverse sectors, and prompt rapid reaction to incidents. Through an annual conference and its Web site at www.first.org
FISMA	Federal Information Security Management Act	defines a comprehensive framework to protect government information, operations, and assets against natural or humanmade threats. FISMA was signed into law part of the Electronic Government Act of 2002.
FIX	Financial Information Exchange	A messaging standard for the electronic exchange of securities transactions. FIX is a public-domain specification owned and maintained by FIX Protocol, Ltd.
FLAC	Free Lossless Audio Codec	a popular free audio compression codec that is lossless. Unlike lossy codecs such as MP3 and AAC, it does not remove any information from the audio stream and is suitable both for everyday playback and for archiving audio collections. http://flac.sourceforge.net/
FLAG	Fiber Link Around the Globe	An undersea fiber-optic cable network connecting Europe to the Asia/Pacific region. It became operational in 1997.
FLOGI	fabric login	The process by which a device gains access to the fabric.
FLOPS	Floating Point Operations Per Second	A slightly more meaningful measure of processor speed than MIPS. Computers essentially work with integer numbers. Decimal values are harder to process, particularly if the figures after the decimal point are not fixed.
FM	Frequency Modulation	A process by which, say, music is transmitted using a radio signal. Input audio-frequency signals modify the frequency of the transmitted signal around its nominal value.
FM-200	Firemaster / Fire Master 200	Fire Master (FM-200) is gas-based fire suppression systems
FMA99	Financial Services Modernization Act of 1999	Signed into U.S. law in November 1999, this legislation — also known as the "Gramm-Leach-Bliley Act," after the senators who sponsored it — allowed many financial institutions to engage in a broader spectrum of activities.
FMC	fixed-mobile convergence	FMC is the trend towards seamless connectivity between fixed and wireless telecommunications networks. The term also describes any physical network that allows cellular telephone sets to function smoothly with the fixed network infrastructure.
FMEA	Failure Mode and Effects Analysis	analytical methods used to identify potential weaknesses. FMEA is mainly employed in the design and development of new products and processes.
FMH	function management header	One or more headers, optionally present in the leading request units (RUs) of an RU chain In SNA, a record that contains control information for the data that follows.
FMV	Full-Motion Video	Video that runs at the same rate at which it was filmed. Moving video images and sound available on a computer; usually stored on CD-ROM because of the large size of the files.
FOC	Field Oriented Control	Field Oriented Control
FoIP	Fax Over Internet Protocol	enables the transmission of fax messages over a VoIP line. In this technology, every digital message is distributed into various packets and then relayed through the Internet.
FOIRL	FiberOptic InterRepeater Link	Fiberoptic communication signaling methodology based loosely on the IEEE 802.3 fiberoptic specification and 10Base-F guideline. FOIRL is a forerunner of the 10Base-FL specification, which is designed to enhance and replace it.
FOMA	Freedom of Mobile Multimedia Access	the brand name for the 3G services being offered by Japanese mobile phone operator NTT DoCoMo. FOMA was the world's first W-CDMA 3G service when launched in 2001.
FOP	Formatting Objects Processor	an XSL-FO processor written in Java, which provides the feature to convert XSL-FO files to PDF or direct-printable-files.
FORTRAN	formula translation	the oldest computer language in the world. It is typically compiled and is quite fast. Its primary drawbacks are portability and ease-of-use -- often different FORTRAN compilers on different platforms behave quite differently in spite of standardization efforts in 1966 (FORTRAN 66 or FORTRAN IV), 1978 (FORTRAN 77), and 1991 (FORTRAN 90).
FOSS	Free and open source software	software developed by informal collaborative networks of programmers. The source code is licensed free of charge, encouraging modifications and improvements.
FOSSIL	Fido Opus Seadog Standard Interface Layer	Fido Opus Seadog Standard Interface Layer
FOT	Fiber Optic Terminal	Connects optical fiber to copper wire.
FOTS	Fiber Optic Transmission System	Fiber Optic Transmission System
FPA	Floating Point Accelerator	Special hardware for performing mathematical calculations with floating point numbers; the FPA may function as a coprocessor to the central processing unit.
FPP	Full Product Package	Full Product Package.
FPS	frames per second	A video transmission metric.
FPA	Function point analysis	a method used to gauge the size and complexity of computer software, employing a function point as a unit of measure. Function points are a unit measure for software size, much like an hour is to measure time.
FPE	Forefront Protection for Exchange	a e-mail security software solution that runs on Exchange
FPGA	Field Programmable Gate Array	A microchip that can be made with thousands of programmable logic gates. FPGAs are often used for prototype or custom designs, including DSP and logic emulation.
FPM	Fast Page Mode	A kind of DRAM memory. Fast page mode improved upon the original page mode memory by eliminating the column address setup time during the page cycle.
FpML	Financial Products Markup Language	A programming language — based on XML — introduced by J.P. Morgan and PricewaterhouseCoopers in June 1999.
FPS	Flexible Payments Service	Amazon's payment services
FPU	floating point unit	a part of a CPU specially designed to carry out operations on floating point numbers. Not all CPUs have a dedicated FPU.
FQDN	Fully Qualified Domain Name	The official name assigned to an individual computer.
FR	frame relay	A network technology that transmits data packets at high speeds across a digital network encapsulated in a transmission unit called a frame. It requires a dedicated connection during the transmission period. It is used on wide area networks and also in private network environments with leased lines over T1 lines.
FRAD	Frame Relay Access Device	A combination of hardware and software that is used to convert communications packets from formats like TCP, SNA, IPX, and others into frames that can then be sent over a frame relay network.
FRAG (21)	Financial Reporting & Auditing Group Guidelines	Financial Reporting & Auditing Group Guidelines
FRDS	Failure Resistant Data Systems	term from the RAID advisory board which describes server systems which are designed to protect against data loss due to any single component failure within the system and against loss of data to single disk failure.
FRED	Fair Random Early Detection	A variation of Random Early Detection (RED)
FreeBSD	Free Berkeley Software Distribution	a Unix-like free operating system descended from AT&T UNIX via the BSD branch through the 386BSD and 4.4BSD operating systems. It runs on processors compatible with the Intel x86 family, as well as on many other processors such as AMD64 and PowerPC processors.
freeware	free software	several kinds of computer software that can legally be copied and given free of charge to other users
FRR	fast retransmit and recovery	congestion control algorithm that makes it possible to quickly recover lost data packets.
FRS	File Replication Service	A service on Windows Servers (2000 and later) that is responsible for replicating policies and scripts to clients.
FRU	field-replaceable unit	An assembly that is replaced in its entirety when any one of its components fails.
FSAA	Full Screen Anti-Aliasing	A method used by 3D graphics cards to provide anti-aliasing to all objects in a 3D environment. This acts to smooth out the jagged appearance of edges on some 3Dobjects.
FSAM	Federated Storage Area Management	HP naturally scalable environment of pooled, federated (i.e., available when needed), modular, multivendor storage resources
FSB	frontside bus	The FSB connects the computer's processor to the system memory (RAM) and other components on the motherboard. These components include the system chipset, AGP card, PCI devices, and other peripherals.
FSM	finite state machine	a model of behavior composed of states, transitions and actions. A state stores information about the past, i.e. it reflects the input changes from the system start to the present moment.
FSML	Financial Services Markup Language	A language developed by the Financial Services Technology Consortium to control the identification and processing of electronic checks.
FSMO	Flexible Single Master Operations	a feature of Microsoft's AD. The schema master FSMO role holder is the domain controller responsible for performing updates to the directory schema.
FSN	Full-Service Network	A video network that makes it possible for the television to work like a computer, through the use of special equipment; users have access to video, home shopping, interactive games, and other services.
FSS	File system server	The StorNext File System term for the computer that manages metadata in a SAN. In Xsan, this is called a metadata controller.
FSSS	Fast Serving Station Switching	refers to the serving station switching with which a Moble Station (MS) can change its serving station from frame to frame depending on the serving station selection mechanism.
FSPF	fibre channel shortest path first	A routing protocol used by fibre-channel switches.
FSTC	Financial Services Technology Consortium	A nonprofit organization whose membership includes banks, government agencies, universities, and high-tech businesses; FSTC is interested in developing e-commerce and making it practical. www.fstc.org
FTA	failure to acquire	a biometrics term that is used to describe a biometric system's failure to extract usable identification data from a biometric sample.
FTAM	File Transfer Access and Management	The International Organization for Standardization's OSI remote file service and protocol
FTDS	Failure Tolerant Data Systems	term from the RAID advisory board which describes server systems which must offer continuous data availability in the event of any single system component failure.
FTNS	Fixed Telecommunication Network Services	FTNS are telecommunications services provided between fixed points.
FTP	File Transfer Protocol	A TCP/IP standard used to log onto a network, list directories and copy files. FTP authenticates users and allows them to transfer files, list directories, delete and rename files on a remote host, and perform wild-card transfers. In LAN technology for user authentication, file transfer, list directories of the foreign host, etc.
FTTB	Fiber to the building	This technology involves bringing fiber all the way to the building. Inside the building, signals would be carried over the existing copper wire or coaxial cable, or over optical fiber.
FTTN	Fiber to the neighborhood	This technology involves bringing fiber into the neighborhood. From there, signals would be carried to businesses and residences via the existing copper wiring.
FR	Frame Relay	A technology for transmitting data packets in high-speed bursts across a digital network encapsulated in a transmission unit called a frame. Frame relay requires a dedicated connection during the transmission period.
FTAM	File Transfer, Access, and Management	an application layer protocol for file transfer and remote manipulation (ISO 8571).
FTBFS	Fails To Build From Source	Fails To Build From Source in computer programming
FTL	Flash Translation Laye	new software layer that redirects each update to an empty block which is already erased and copies other valid data to a new location.
FTP	File Transfer Protocol	The usual way you send files to your server (or receive some). Using FTP, you can also update (delete, rename, move, and copy) files at a server. People who create Web home pages use FTP to get their files to the server where they will be accessed.
FUD	Fear, Uncertainty, and Doubt	A set of sales tactics employed by market leaders to cast aspersion on competing computer products.
FUSC	Fully Used SubChannel	also known as Fully Used SubCarrier, is a method used in the WiMAX network that uses all the subchannels and employs full-channel diversity by distributing the allocated subcarriers to subchannels using a permutation mechanism.
FW	Firewall	A boundary that helps keep computers on the Internet private. Firewall software helps prevent users from coming to a secure site, or conversely, keeps users inside the firewall from going out. Firewalls can also verify websites, helping to ensure they originate from an authorized source.
FWA	Fixed wireless access	also known as wireless local loop, is a wireless system in which office or home users directly connect with the switching center of the telecommunications carrier or the inter-exchange channel to use the system.
FX	foreign exchange	Account settlements or transfers of credit or currency across national borders, a process that typically relies heavily on computer technology. A telecommunications connection between a customer's location and a remote exchange. see also FXO, FXS
FXO	Foreign Exchange Office	An FXO interface connects to the PSTN central office and is the interface offered on a standard telephone. Cisco's FXO interface is an RJ-11 connector that allows an analog connection at the PSTN's central office or to a station interface on a PBX.
FXP	File eXchange Protocol Foreign Exchange Protocol fxp	allows you to copy files from one FTP server to another FTP server (two remote hosts) using an FXP client. a simple, automatic way of retrieving currency exchange rates over the Internet. file extension for the compiled source code for FoxPro
FXS	Foreign Exchange Station	An FXS interface connects directly to a standard telephone and supplies ring, voltage, and dial tone. Cisco's FXS interface is an RJ-11 connector that allows connections to basic telephone service equipment, keysets, and PBXs.
	face recognition	A biometric technique that uses the geometry of a person's face to authenticate identity. Limited deployments, such as those for check cashing, are in place.
	failover	Failover is a backup operational mode in which the functions of a system component are assumed by secondary system components when the primary component becomes unavailable through either failure or scheduled down time.
	FastIP	An IP switching protocol developed by 3Com. Fast IP differs from other IP switching in that the end user initiates the process, not a router or switch.
	Fault-tolerance	Ability of a system or component to continue normal operation despite equipment failures, power outages or other catastrophic events.
	Federation	A technical approach where one security domain has a system to authenticate users and another security domain has a system that trusts the authenticating system
	female connector	A cable connector that has holes and plugs into a port or interface to connect one device to another.
	fetch	The process of 'fetching' a data or instruction item from memory and writing it to a register. The 'fetched' item is then either executed (instruction), or acted upon (data).
	fiber optics	A technology that transmits infrared and visible light frequencies through strands of glass or plastic fiber.
	File extension	.gif .txt .doc .log etc. are all examples of file extensions. These are the letters after the period in a file name that indicates the type of file.
	FileZilla	FileZilla is free, open source, cross-platform FTP software, consisting of FileZilla Client and FileZilla Server. Binaries are available for Windows, Linux, and Mac OS X. It supports FTP, SFTP, and FTPS (FTP over SSL/TLS). http://filezilla-project.org/
	Finger	A program that you point at the username of someone on a networked system. It uncovers that person's full name, most recent log-in time, and other information. It's also used as a verb, meaning to apply the program to the user name. A Unix command that provides information about users logged in; and it can also be used to retrieve the .plan and .project files from a user's home directory. A gesture by a programmer to another person that has ripped off his code without even recognition.
	Fire Fighting	Desperately working to fix bugs to avoid being fired.
	firewire	technology that allows a computer to have an almost unlimited number of devices running without using up all the hardware interrupts. the registered trademark of Apple's IEEE 1394 digital connection.
	Firmware	A computer program or software stored permanently in PROM or ROM or semi-permanently in EPROM. Software stored in PROM, ROM or EPROM; essential programs that remain even when the system is electrically turned off. Firmware is considerably easier to modify than hardware but more permanent than software stored on disk or volatile memory.
	five 9s	The five 9s of accuracy: 99.999% accuracy
	flash	Flash memory (FLEXIBLE ARCHITECTURE for SHARED MEMORY): This type of non-volatile memory has the ability to retain its information even when there is no power source. FLASH is erased (or bulk erased) electrically erasable programmable read-only memory (EEPROM). FLASH has the electrically erasable benefits of EEPROM but the small, economical cell size of EPROM technology A bandwidth friendly and browser independent vector-graphic animation technology. As long as different browsers are equipped with the necessary plug-ins, Flash animations will look the same. As of late 2005, Macromedia is now owned by Adobe
	flatrate	pricing plan for Telco
	flooding	An attack that attempts to cause a failure in (especially, in the security of) a computer system or other data processing entity by providing more input than the entity can process properly.
	footer	A formatting style designated in HTML by a specific tag and used at the end of an HTML file.
	forest	A collection of one or more domain trees with a common schema and implicit trust relationships between them.
	fork	A stream of data that can be opened and accessed individually under a common filename. The Mac OS Standard and Extended file systems store a separate data fork and resource fork as part of every file. In BSD, fork is a system call that creates a new process.
	frame	A packet of data including start and end of frame delimiters. An HTML feature that allows web designers to segment the window of a web browser into distinct sections.
	Frixo	UK road travel reporting website, that provides our users with the most up-to-date road traffic information. Our data is updated every 5 minutes using sensors placed on motorways and common A / B roads. www.frixo.com
	fuzzy logic	a formal system of reasoning developed by Lotfi Zadeh in which the values “true” and “false” are replaced by numbers on a scale from 0 to 1.