Technology terms starting with S

2,256 terms

ship's emergency transmitter A ship's transmitter to be used exclusively on a distress frequency for distress, urgency or safety purposes. [NTIA] [RR]
SHIPALT Ship Alteration.
shock excitation Synonym impulse excitation.
shock spectrum Synonym response spectrum.
Shoot-Back The technique of defending a space asset by shooting at an attacker. 264
Shoot-Look-Shoot (SLS) A tactic used to achieve Defense Engagement Options (DEOs), such as assured kill by shooting at the target, looking to see if it was killed, and shooting…
shopping basket In electronic commerce (also called "e-commerce"), an application allowing users of a commercial Web site to select products from the screen display as…
SHORAD Short-Range Air Defense.
short A Java keyword used to define a variable of type short.
Short Circuit Test Line The term "Short Circuit Test Line" denotes an arrangement in an end office which provides for an ac short circuit termination of a trunk or line by means…
short haul toll traffic A general term applied to message toll traffic between nearby points. In common usage, this term is ordinarily applied to message toll traffic between…
short interruption event (SIE) An event beginning with the occurrence of a bit error ratio (BER) of 10-2 or worse, continuously for each of three or more consecutive seconds, which can…
short message service (SMS) A service in GSM mobile telephony systems that allows the user to send and receive short (maximum 160-character) messages independently of voice calls; a…
Short Range Air Launch Target Single-stage, air-launched, solid propellant theater target with threat representative reentry vehicle.
Short Range Ballistic Missile (SRBM) A ballistic missile with a range capability of 30 km to 1,000 km. (USSPACECOM)
short wavelength In optical communication, optical radiation having a wavelength less than approximately 1 m.
Short Wavelength Infrared (SWIR) Thermal radiation emitted by a source in the electromagnetic spectrum encompassing infrared wavelengths of 0.75 to 3 microns.
short-circuit operator An operator in which only as many operands are evaluated as are needed to determine the final result of the operation.
short-term retention retention of a record for less than ten (10) years.
shortcut key A key-press associated with a component in a Graphical User Interface (GUI) that provides an alternative to selecting the component's operation with a…
Shortwave Also known as Shortwave Trough; a disturbance in the mid or upper part of the atmosphere which induces upward motion ahead of it.
Shoskeles An animated ad that moves across the browser, usually with sound effects. It animates only long enough to play a message before settling into a stationary…
shot noise The noise caused by random fluctuations in the motion of charge carriers in a conductor.
SHOTL Simulated Hot Launch (missile engineering term).
shp Shaft Horsepower.
Shrouded RVs Reentry vehicles enclosed in a material designed to shield its thermal and other characteristics.
shut down To halt and power off a computer.
shutdown action A predefined bootstrap action that launches a script that executes a series of commands in parallel before terminating the job flow.
SHV A server software counterpart to a system health agent (SHA). A system health validator verifies the statement of health (SoH) made by its respective SHA.
SI Special Intelligence.
SI&I Systems Integration and Interoperability.
sibling document In a view or folder, a document at the same level as another document.
sibling sub classes Classes that have the same immediate super class. See inheritance hierarchy.
SIC See Standard Industrial Classification (SIC)
SICPS Standard Integrated Command Post Shelter.
SID See definition for: security ID (SID)
SID filter quarantining A strict form of security identifier (SID) filtering that is applied to external trust relationships by default, which prevents any SIDs that are not part…
SID filtering A security enhancement that is applied to all Active Directory trust relationships to reduce the possibility of escalation of privilege attacks from…
SIDAC Single Integrated Damage Assessment Capability.
SIDD System Interface Description Document (US Army term).
side circuit Either of the two circuits used to derive a phantom circuit.
side effect An effect of a drug, chemical, or other medicine that is in addition to its intended effect, especially an effect that is harmful or unpleasant.
side effects Something extra that happens when you evaluate an "expression". Nowadays it can refer to almost anything.
side lobe In a directional antenna radiation pattern, a lobe in any direction other than that of the main lobe.
sideband In amplitude modulation (AM), a band of frequencies higher than or lower than the carrier frequency, containing energy as a result of the modulation…
sideband transmission See single-sideband transmission.
Sidelobes Residual EMR surrounding the main beam, which is of weaker power than the main beam.
sidetone The sound of the speaker's own voice (and background noise) as heard in the speaker's telephone receiver.
SIDPERS Standard Installation Division Personnel System (US Army term).
SIDS The sudden and unexpected death of a healthy child who is younger than one year old, usually during sleep. The cause of SIDS is not known.
SIE SATKA Integrated Experiment.
SIF (1) System Integration Facility. (2) Selective Identification Feature
SIG Abbreviation for special interest group. 1. Within a given technical discipline or area of knowledge, a circle of individuals or organizations having an…
SIGINT Signal Intelligence.
Sign A fixture or area containing lettering or logos used to advertise a store, goods, or services.
sign bit In twos-complement notation, the most significant bit in an integer value is used to determine the sign of the value.
sign extension When an integer value from a type with a particular range is stored in a variable with a bigger range, Java uses sign extension to determine the resulting…
sign-out See check-out.
signal A bolt out of the blue; that is, an event triggered by the "operating system", probably when you're least expecting it.
signal center A combination of signal communication facilities operated by the Army in the field and consisting of a communications center, telephone switching central…
signal compression In analog (usually audio) systems, reduction of the dynamic range of a signal by controlling it as a function of the inverse relationship of its…
signal contrast In facsimile, the ratio of the level of the white signal to the level of the black signal. Note: Signal contrast is usually expressed in dB.
signal conversion equipment Synonym modem.
signal distance A measure of the difference between a given signal and a reference signal. Note: For analog signals, the signal distance is the root mean square…
signal distortion See distortion.
signal droop In an otherwise essentially flat-topped rectangular pulse, distortion characterized by a decline of the pulse top.
signal duration A multifrequency (MF) or dual-tone multifrequency (DTMF) signal timing interval during which the signal is being transmitted.
signal element A part of a signal, distinguished by its nature, magnitude, duration, transition, or relative position.
signal expansion Restoration of the dynamic range of a compressed signal.
signal frequency shift See frequency shift.
signal handler A "subroutine" that, instead of being content to be called in the normal fashion, sits around waiting for a bolt out of the blue before it will deign to…
signal intelligence See signals intelligence.
signal level In a communications system, the signal power or intensity at a specified point and with respect to a specified reference level, e.g., 1 mW.
signal message In communications systems, a message, i.e., an assembly of signaling information, that (a) includes associated message alignment and service indications…
signal processing The processing--such as detection, shaping, converting, coding, and time positioning--of signals, that results in their transformation into other forms…
signal processing gain The ratio of (a) the signal-to-noise ratio of a processed signal to (b) the signal-to-noise ratio of the unprocessed signal.
signal reference subsystem The portion of a facility grounding system that (a) provides reference planes, such as ground-return circuits, for all of the signal paths in the facility…
signal regeneration Signal processing that restores a signal so that it conforms to its original characteristics.
signal sample The value of a particular characteristic of a signal at a chosen instant.
signal sampling The process of obtaining a sequence of instantaneous values of a particular signal characteristic, usually at regular time intervals.
signal security A generic term that includes both communications security and electronics security. [JP 1-02]
signal transfer point (STP) In a common-channel signaling network, a switch that provides for the transfer from one signaling link to another.
signal transition In the modulation of a carrier, a change from one significant condition to another.
signal unit (SU) A group of bits forming a separately transferable entity used to convey information on a signaling link. [T1.226-1992]
signal unit alignment The alignment that exists when flags are received at intervals that correspond to integral numbers of octets and that fall within certain upper and lower…
signal unit error rate monitoring A procedure by which the error rate of an active signaling link is measured on the basis of a count of correctly checking and erroneous signal units. [T1.
signal unit sequence control Procedures used at Level 2 to ensure that message signal units are transported in sequence, without loss or duplication, over a particular signaling link.
signal-plus-noise-plus-distortion to noise-plus-distortion ratio See SINAD.
signal-plus-noise-to-noise ratio ((S+N)/N) At a given point in a communications system, the ratio of (a) the power of the desired signal plus the noise to (b) the power of the noise.
signal-return circuit A current-carrying return path from a load back to the signal source, i.e., the low side of the closed loop energy transfer circuit between a source-load…
Signal-to-C-Notched Noise Ratio The term "Signal-to-C-Notched Noise Ratio" denotes the ratio in dB of a test signal to the corresponding C-Notched Noise.
signal-to-crosstalk ratio At a specified point in a circuit, the ratio of the power of the wanted signal to the power of the unwanted signal from another channel.
Signal-to-Noise Ratio A specifically produced response (signal) compared to the response level (noise) when no specific stimulus (activity) is present.
Signal-to-Noise Ratio (S/N) (SNR) Relative power of the signal to the noise in a channel; usually measured in decibels. 265
signal-to-noise ratio (SNR) The ratio of the amplitude of the desired signal to the amplitude of noise signals at a given point in time.
signal-to-noise ratio per bit The ratio given by Eb/N0, where Eb is the signal energy per bit and N0 is the noise energy per hertz of noise bandwidth.
signaling The use of signals for controlling communications. 2. In a telecommunications network, the information exchange concerning the establishment and control…
signaling channel A data channel in combination with its associated signaling terminal equipment. [T1.226-1992]
signaling connection control part (SCCP) 1. A component part of SS7 protocol that provides additional functions to the message transfer part (MTP) to provide for Connectionless and Connection…
signaling data link A combination of two data channels operating together in a single signaling system. [T1.226-1992]