Engineering Acronyms and Abbreviations

A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z

A - Ad, Ae - Ame, Ami - Ar, As - Az

a - atto (10-18)
Å - angstrom [1 x 10-10 meters in length]
A - ampere
AACS - Advanced Access Content System (The Advanced Access Content System (AACS) is a standard for content distribution and digital rights management, intended to restrict access to and copying of the post-DVD generation of optical discs.)
AAPS - Airborne Antenna Pedestal System [Antenna Terms]
AAR - Automated Alternate Routing (Automated alternate routing (AAR) provides a mechanism to reroute calls through the PSTN or other network by using an alternate number when Communications Manager blocks a call due to insufficient location bandwidth. With automated alternate routing, the caller does not need to hang up and redial the called party.)
ABI - Address Bit Inversion
ABIST - Automatic Built-In-Self-Test (A built-in self-test (BIST) or built-in test (BIT) is a mechanism that permits a machine to test itself. Engineers design BISTs to meet requirements such as: high reliability lower repair cycle times or constraints such as: limited technician accessibility cost of testing during manufacture)
ABS - Acrylonitrile Butadiene Styrene; Plastic [Fire Retardant] (ABS is a common thermoplastic polymer. Its glass transition temperature is approximately 105 C (221 F). ABS is amorphous and therefore has no true melting point. ABS is a terpolymer made by polymerizing styrene and acrylonitrile in the presence of polybutadiene. The proportions can vary from 15 to 35% acrylonitrile, 5 to 30% butadiene and 40 to 60% styrene. The result is a long chain of polybutadiene criss-crossed with shorter chains of poly(styrene-co-acrylonitrile). The nitrile groups from neighboring chains, being polar, attract each other and bind the chains together, making ABS stronger than pure polystyrene. The styrene gives the plastic a shiny, impervious surface. The polybutadiene, a rubbery substance, provides toughness even at low temperatures. For the majority of applications, ABS can be used between -20 and 80 C (-4 and 176 F) as its mechanical properties vary with temperature. The properties are created by rubber toughening, where fine particles of elastomer are distributed throughout the rigid matrix. )
AC - Alternating Current (Alternating current (AC), is an electric current in which the flow of electric charge periodically reverses direction, whereas in direct current (DC, also dc), the flow of electric charge is only in one direction. The abbreviations AC and DC are often used to mean simply alternating and direct, as when they modify current or voltage)
AC-3 - Audio Codec 3 (AC-3 Filter is a high quality free audio decoder and processor filter. It allows media players to playback movies with AC3 and DTS audio tracks. Also it can process any audio track, much of processing options allows to adjust the sound in almost any way. It is possible to upmix any audio source to 6 channels. Filter can do multi-channel and digital (SPDIF) output. It can encode any audio source to AC3 on-the-fly and send it over SPDIF to the receiver.)
ACA - automatic circuit assurance (Automatic circuit assurance (ACA) helps you identify possible trunk malfunctions. With ACA enabled,the system measures the holding time of each trunk call. If the measurements show calls with eitherextremely long or extremely short holding times, Avaya Communication Manager places a referral call toan attendant or telephone.)
AC/DC - Alternating Current/Direct Current (Alternating current (AC), is an electric current in which the flow of electric charge periodically reverses direction, whereas in direct current (DC, also dc), the flow of electric charge is only in one direction. The abbreviations AC and DC are often used to mean simply alternating and direct, as when they modify current or voltage)
ACI - Adjacent Channel Interference (Adjacent-channel interference (ACI) is interference caused by extraneous power from a signal in an adjacent channel. ACI may be caused by inadequate filtering (such as incomplete filtering of unwanted modulation products in FM systems), improper tuning or poor frequency control (in the reference channel, the interfering channel or both).)
ACIM - AC Induction Motor (The AC Induction Motor (ACIM), sometimes called a squirrel cage motor, is one of the most popular motors used in consumer and industrial applications. Induction machines are by far the largest group of all industrial electrical machines, converting approximately 70-80% of all electrical energy into mechanical form. The have a very robust rotor construction, which makes them suitable for high-speed applications. With proper design, they have good overloading and field weakening characteristics.)
ACK - acknowledge character [ASCII code] (An acknowledge character (ACK) is a control character transmitted by the receiving station as an acknowledgement, i.e. an affirmative response to the sending station, perhaps in response to the sending station's transmission of an ENQ.)
ACP - Applied Computing Platform
ACR - Advanced Communication Riser (The Advanced Communications Riser, or ACR, is a form factor and technical specification for PC motherboard expansion slots. It is meant as a supplement to PCI slots, a replacement for Audio/modem riser (AMR) slots, and a competitor and alternative to Communications and Networking Riser (CNR) slots.)
ACTS - Advanced Communications Technology Satellite (ACTS is the first high-speed, all-digital communications satellite. It is the first to have sophisticated telephone-system-type switching onboard. It can carry data at standard fiber-optic data rates with the same transmission quality, added performance, and cost savings that a land-based network provides. It operates in the uncrowded Ka-band (18 to 30 gigahertz) portion of the radio spectrum. ACTS technology integrates well with ground telephone network systems, allowing for high-speed transmission over great distances to even the remotest locations.)
A-D - analog-to-digital (Analog-to-digital conversion is an electronic process in which a continuously variable (analog) signal is changed, without altering its essential content, into a multi-level (digital) signal.)
ADB - Apple Desktop Bus (Apple Desktop Bus (ADB) is a bit-serial computer bus connecting low-speed devices to computers. It was introduced on the Apple IIGS in 1986 as a way to support low-cost devices like keyboards and mice, allowing them to be connected together in a daisy chain without the need for hubs or other devices. ADB was quickly introduced on later Macintosh models, and also found use on computers from NeXT, and saw some other 3rd party use as well. ADB was rapidly replaced by USB as that system became popular in the late 1990s; the last external ADB port on an Apple product was in 1999, though it remained as an internal-only bus on some Mac models into the 2000s.)
ADC - analog-to-digital converter (An analog-to-digital converter (ADC, A/D, AD, or A-to-D) is a device that converts a continuous physical quantity (usually voltage) to a digital number that represents the quantity's amplitude. An ADC may also provide an isolated measurement such as an electronic device that converts an input analog voltage or current to a digital number proportional to the magnitude of the voltage or current. However, some non-electronic or only partially electronic devices, such as rotary encoders, can also be considered ADCs. The digital output may use different coding schemes. Typically the digital output will be a two's complement binary number that is proportional to the input, but there are other possibilities. An encoder, for example, might output a Gray code.)
ADCCP - Advanced Data Communication Control Procedures (In telecommunication, Advanced Data Communication Control Procedures (or Protocol) (ADCCP) is a bit-oriented data link layer protocol used to provide point-to-point and point-to-multipoint transmission of data frames that contain error control information. It places data on a network and ensures proper delivery to a destination. ADCCP is based on the IBM's SDLC protocol. The HDLC by ISO and LAPB by ITU/CCITT are based on ADCCP)
ADF - Advanced Differential Fabric (Advanced Differential Fabric (ADF) is a connector system, by the PCI Industrial Computer Manufacturers Group (PICMG) has been specified for AdvancedTCA. It involves planar, rectangular connector for high-speed transmissions at data rates of 3 Gb / s to 10 Gbit / s. About them the signals of PCI Express are transmitted.)
ADH - automatic data handling (A generalization of automatic data processing to include the aspect of data transfer. )
ADN - Aircraft Data Networks [Avionic Networks] (Aircraft Data Network (ADN) is a concept introduced by the Airlines Electronics Engineering Committee (AEEC) in the ARINC 664 Specification. The specification proposes data networking standards recommended for use in commercial aircraft installations. The standards provide a means to adapt COTS networking standards to an aircraft environment. It refers to devices such as bridges, switches, routers and hubs and their use in an aircraft environment. This equipment, when installed in a network topology, can provide effective data transfer and overall avionics performance. The ARINC 664 specification refers extensively to the set of data networking standards developed by the Internet community and IEEE.)
ADP - automatic data processing (ADP, LLC., is an American provider of human resources management software and services. ADP was formerly one of four American companies to get a AAA credit rating from Standard & Poor's (S&P) and Moody's, but S&P and Moody's downgraded ADP to AA in April 2014, after the dealer services unit spin off)
ADPCM - adaptive differential pulse-code modulation (Adaptive differential pulse-code modulation (ADPCM) is a variant of differential pulse-code modulation (DPCM) that varies the size of the quantization step, to allow further reduction of the required data bandwidth for a given signal-to-noise ratio. Typically, the adaptation to signal statistics in ADPCM consists simply of an adaptive scale factor before quantizing the difference in the DPCM encoder)
ADPE - automatic data processing equipment (automatic data processing equipment (ADPE): Any equipment or interconnected system or subsystems of equipment that is used in the automatic acquisition, storage, manipulation, management, movement, control, display, switching, interchange, transmission, or reception, of data or information by a Federal agency, or under a contract with a Federal agency which requires the use of such equipment, or requires the performance of a service or the furnishing of a product which is performed or produced making significant use of such equipment.)
ADPI - Advanced Configuration and Power Interface (In computing, the Advanced Configuration and Power Interface (ACPI) specification provides an open standard that operating systems can use to perform discovery and configuration of computer hardware components, to perform power management by, for example, putting unused components to sleep, and to do status monitoring. Internally, ACPI advertises the available components and their functionalities to the operating system kernel using instruction lists (methods) provided through the system firmware (UEFI or BIOS), which the kernel parses and then executes the desired operations (such as the initialization of hardware components) using an embedded minimalistic virtual machine.)
ADPSSO - automated data processing system security officer
ADSI - Advanced Distributed System Interface
ADSL - Asymmetric Digital Subscriber Line (Asymmetric digital subscriber line (ADSL) is a type of digital subscriber line (DSL) technology, a data communications technology that enables faster data transmission over copper telephone lines rather than a conventional voiceband modem can provide. ADSL differs from the less common symmetric digital subscriber line (SDSL). Bandwidth (and bit rate) is greater toward the customer premises (known as downstream) than the reverse (known as upstream). This is why it is called asymmetric. Providers usually market ADSL as a service for consumers to receive Internet access in a relatively passive mode: able to use the higher speed direction for the download from the Internet but not needing to run servers that would require high speed in the other direction.)

MEO 6,3

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