bits per pixel (BPP)In a digitized image, the number of bits used to represent the luminance (brightness, gray scale) and chroma (color) information contained in each pixel.
bits per second (b/s)A unit used to express the number of bits passing a designated point per second.
bitwise operatorAn operator that manipulates the bits of one or more of its operands individually and in parallel.
BIUAbbreviation for bus interface unit. See network interface device.
BLACK[A] designation applied to telecommunications and automated information systems, and to associated areas, circuits, components, and equipment, in which…
Black BodyA hypothetical object that absorbs all of the radiation that strikes it; also emits radiation at a maximum rate for its given temperature.
black boxA generic term for a single-purpose device having limited functionality. Note: A black box is usually represented in schematic drawings as a geometric…
black burstA composite color video signal comprised of sync, color burst, and black video.
black facsimile transmissionIn facsimile systems using amplitude modulation, that form of transmission in which the maximum transmitted power corresponds to the maximum density of…
Black Hat SEOSearch engines set up guidelines that help them extract billions of dollars of ad revenue from the work of publishers and the attention of searchers.
black levelOf a television baseband signal (e.g., NTSC composite video), the voltage level corresponding to black or to the maximum limit of black peaks.
Black ListBlock email from email addresses and domains added to this list.
black noiseNoise that has a frequency spectrum of predominately zero power level over all frequencies except for a few narrow bands or spikes.
black recording1. In facsimile systems using amplitude modulation, recording in which the maximum received power corresponds to the maximum density of the record medium.
BLACK signalA signal that represents only unclassified or encrypted information, usually in cryptographic systems.
BlackbodyAn ideal substance that absorbs all radiation falling on it, and reflecting nothing.
BlacklistA Blacklist collects known sources of spam. Email traffic then can be filtered against a blacklist to remove spam.
BlackoutThe disconnection of the source of electricity from all the electrical loads in a certain geographical area brought about by an emergency forced outage or…
bladeUsually a part of an excavator which digs and pushes dirt but does not carry it.
blade servera rack-mounted chassis which accepts multiple modularized server blades and provides shared network and power resources, resulting in high server density…
BLADESBMD Long Wavelength Infrared Advanced Exo -atmospheric Sensor.
blank final variableA final variable that is not initialized as part of its declaration. Such a variable must be initialized in either an instance initialization block or all…
Blank NodeA resource, or node in an RDF graph, which is not identified by a URI; can be used as subject or object in an RDF triple (RDF statement).
blanketingThe interference that is caused by the presence of an AM broadcast signal of one volt per meter (V/m) or greater strengths in the area adjacent to the…
blanketing areaIn the vicinity of a transmitting antenna, the area in which the signal from that antenna interferes with the reception of other signals.
blankingThe period of time in which no video image is displayed. [JP 1-02] 2. In graphic display, the suppression of the display of one or more display elements…
blanking intervalIn raster-scanned television technology, the period between (a) the end of one horizontal scanning line and the beginning of the next (the horizontal…
blanking levelIn a baseband television signal, the DC level (nominally 0 volts) from which the amplitudes of the various components of the signal are measured.
Blast EffectDestruction of or damage to structures and personnel by the force of an explosion on or above the surface of the ground.
Blast WaveA sharply defined wave of increased pressure rapidly propagated through a surrounding medium from a center of detonation or similar disturbance.
Blended AttackMalicious code that uses multiple methods to spread.
blessIn corporate life, to grant official approval to a thing, as in, "The VP of Engineering has blessed our WebCruncher project.
blind transmissionTransmission without obtaining a receipt, i.e., acknowledgement of reception, from the intended receiving station.
blinkingIn graphic display devices, an intentional periodic change in the intensity of one or more display elements or display segments.
blip codeAn optical mark, usually rectangular, that has been recorded below a microfilm image and is used for counting or indexing images or frames automatically…
BLOBA discrete packet of binary data that has an exceptionally large size, such as pictures or audio tracks stored as digital data, or any variable or table…
blockA repetition/replication of the Early, Mid and Late Seral Treatment plots and a Control plot. See Repetition/replication.
block bufferingA method of making input and output efficient by passing one "block" at a time. By default, Perl does block buffering to disk files.
block checkIn the processing or transmission of digital data, an error-control procedure that is used to determine whether a block of data is structured according to…
Block Check Character (BCC)The result of a transmission verification algorithm accumulated over a transmission block, and normally appended at the end, e.g., CRC, LRC.
Block CipherA symmetric key cryptographic algorithm that transforms a block of information at a time using a cryptographic key.
Block Cipher AlgorithmA family of functions and their inverses that is parameterized by a cryptographic key; the function maps bit strings of a fixed length to bit strings of…
block codeAn error detection and/or correction code in which the encoded block consists of N symbols, containing K information symbols (K<N) and N-K redundant check…
Block DataA group of data records that are manipulated together as a unit, such as database records.
block deviceA storage device that supports reading and (optionally) writing data in fixed-size blocks, sectors, or clusters.
block device mappingA mapping structure for every AMI and instance that specifies the block devices attached to the instance.
block diagramA diagram of a system, a computer, or a device in which the principal parts are represented by suitably annotated geometrical figures to show both the…
block distortionIn the received image in video systems, distortion characterized by the appearance of an underlying block encoding structure.
block droppingA process by which one or more of the less significant bits of all the samples stored in a packet are dropped to alleviate congestion. [T1.509-1995]
block efficiencyIn a block, the ratio of the number of user information bits to the total number of bits.
Block Enhancement Plan (BEP)The BEP documents Ballistic Missile Defense System technology development objectives and defines the steps necessary to achieve those objectives.
block errorA block within which at least one bit error occurs when the block is transferred from the source to the destination within the time slot assigned.
Block HolderThe Service Provider to which a thousands-block (NXX-X) has been assigned for use.
block lengthThe number of data units, such as bits, bytes, characters, or records, in a block.
Block Level AnalysisA method used to break a page down into multiple points on the web graph by breaking its pages down into smaller blocks.
Block ManagerThe individual selected to exercise management over a development Block. BMDS Block management includes decision points at which activities will be…
block parityThe designation of one or more bits in a block as parity bits used to force the block into a selected parity, either odd or even.
Block phraseA custom word or phrase that the administrator sets for the Content Filter agent to prevent e-mail messages that contain specific words or phrases from…
block transferThe process, initiated by a single action, of transferring one or more blocks of data.
block transfer attemptA coordinated sequence of user and telecommunication system activities undertaken to effect transfer of an individual block from a source user to a…
block transfer efficiencyThe average ratio of user information bits to total bits in successfully transferred blocks.
block transfer failureFailure to deliver a block successfully. Note: The principal block transfer failure outcomes are: lost block, misdelivered block, and added block.
block transfer rateThe number of successful block transfers during a performance measurement period divided by the duration of the period.
block transfer timeThe average value of the duration of a successful block transfer attempt. Note: A block transfer attempt is successful if (a) the transmitted block is…
block-error ratioThe ratio of the number of incorrectly received blocks to the total number of blocks transferred.
block-loss probabilityThe ratio of the number of lost blocks to the total number of block transfer attempts during a specified period.
block-misdelivery probabilityThe ratio of the number of misdelivered blocks to the total number of block transfer attempts during a specified period.
block-numericA records classification system that assigns number ranges to subjects (e.g., the Dewey Decimal system)
Blocked CallA blocked call is said to have occurred when a call presented to a telecommunications Service Provider (SP) facility cannot be completed due to Blocking.
BlockingThe sticking together or adhesion of successive windings in a tape pack. Blocking can result from (1) deterioration of the binder, (2) storage of tape…
blocking criterionIn telephone traffic engineering, a criterion that specifies the maximum number of calls or service demands that fail to receive immediate service.
blocking factorIn a tape backup operation, the number of tape blocks that are transferred in each write operation.
blocking formulaA specific probability distribution function intended to model calling patterns of users who fail to find available facilities.
blocking networkIn telecommunications, a network that has fewer transmission paths than would be required if all users were to communicate simultaneously.
BlogBlogs, also referred to as Web logs, are frequent, chronological Web publications consisting of links and postings.
Blog Comment SpamEither manually or automatically (via a software program) adding low value or no value comments to other sites. Automated blog spam: Nice post!
BloggerBlogger is a free blog platform owned by Google. It allows you to publish sites on a subdomain off of Blogspot.com, or to FTP content to your own domain.
BlogrollLink list on a blog, usually linking to other blogs owned by the same company or friends of that blogger.
Bloom filterCompression scheme used by the Replica Location Service (RLS) that is intended to reduce the size of soft state updates between Local Replica Catalogs…
Blue ForcesThose forces used in a friendly role during exercises.
BluetoothA low-power, short-range, rf technology that allows the connection of intelligent communications devices or appliances in a household or an office in a…
blurringIn television and video systems, a global distortion over the entire image, characterized by reduced sharpness of edges and limited spatial detail. [T1.