20,531 terms including subtopics (0 terms filed directly here)
Technology terms
Signature HistoriesA list of observed target signature characteristic parameter values as a function of missile flight time used for target discrimination and kill…
Signature LineA set of 4 - 8 lines of text placed at the end of a mail message to provide the reader with the author's contact information, favorite quote, special of…
Signature VerificationUses a digital signature algorithm and a public key to verify a digital signature.
Signed DataData on which a digital signature is generated.
significant conditionIn the modulation of a carrier, one of the values of the signal parameter chosen to represent information.
significant digitIn a representation of a number, a digit that is needed for a given purpose; in particular, a digit that must be kept to preserve a given accuracy or a…
significant instantIn a signal, any instant at which a significant condition of a signal begins or ends.
significant intervalThe time interval between two consecutive significant instants.
signingAn advanced security feature that verifies the sender's identity and verifies that the message hasn't been modified during transit. [Exchange 5.5]
SIIPTSystem Integration Integrated Product Team (THAAD Program term).
SILA general term for the abnormal growth of squamous cells on the surface of the cervix.
silence codeIn digital telephony, a code composed of a reserved binary number that is sent instead of an actual sound sample value from the CODEC when the incoming…
silent intervalAny portion of a ringing cycle during which the ringing signal is not being applied. [T1.401-1998]
silicon photodiodeA silicon-based PN- or PIN-junction photodiode. Note 1: Such photodiodes are useful for direct detection of optical wavelengths shorter than approximately…
Siloan alternative name for an Automated Cartridge System. See ACS.
silver halide microfilmArchival quality polyester-based film containing images produced by exposure of light sensitive silver halide crystals suspended in a gelatin emulsion See…
SIM (Subscriber Identity Module)A Subscriber Identity Module (SIM) is a stripped-down smart card containing information about the identity of a cell-phone subscriber, and subscriber…
Similarity ScoreA value returned by a biometric algorithm that indicates the degree of similarity or correlation between a biometric sample and a reference.
Similarity searchingThe ability to search for similar documents. Similar in a search context may be similar to a document in a result set or similar to an example document.
Simple Network Management Protocol (SNMP)A standard Internet protocol that facilitates communications between a system being managed and the management console or framework.
simple scanningIn facsimile transmission, scanning using only one spot at a time.
Simple Security ConditionA Bell- LaPadula security model rule allowing a subject read access to an object only if the security level of the subject dominates the security level of…
simple security property[The] Bell-La Padula security model rule allowing a subject read access to an object, only if the security level of the subject dominates the security…
Simple Storage Service (S3)(S3)A storage web service that provide storage through web services interfaces such as REST, SOAP and BitTorrent.
SimpleDBA flexible distributed database writen in Erlang that stores data and serves users’ requests.
simplex (SX) signalingSignaling in which two conductors are used for a single channel, and a center-tapped coil, or its equivalent, is used to split the signaling current…
simplex circuitA circuit that provides transmission in one direction only. 2. Deprecated definition: A circuit using ground return and affording communication in either…
simplex operationOperation in which transmission occurs in one and only one preassigned direction. Synonym one-way operation.
simplex protocolA communications protocol that is purely one-way, and where acknowledgments are not part of any application protocol.
simulateTo represent certain features of the behavior of a physical or abstract system by the behavior of another system.
SimulationIn cancer treatment, a process used to plan radiation therapy so that the target area is precisely located and marked.
SimulatorA generic term used to describe a family of equipment used to represent threat weapon systems in development testing, operational testing, and training.
simultaneous multithreadingsimilar to time-slice multithreading (superthreading), except that the multiple threads introduced into the pipelines on a given clock cycle can be from…
SINADAbbreviation for signal-plus-noise-plus-distortion to noise-plus-distortion ratio. 1. The ratio of (a) total received power, i.e.
singingAn undesired self-sustained audio oscillation in a circuit. Note: Singing is usually caused by positive feedback, excessive gain, or unbalance of a hybrid…
singing marginThe difference in power levels between the singing point and the operating gain of a system or component.
singing pointThe threshold point at which additional gain in the system will cause self-oscillation.
Singing Return Loss (High & Low)The term "Singing Return Loss" denotes the frequency weighted measure of return loss at the edges of the voice band, where singing (instability) problems…
single classComprising or containing only one security class [CESG].
single class deviceA device which can only be used to process information of a single security class at a time [CESG]
single inheritanceIn Java, a class may not extend more than one class. This means that Java has a single inheritance model for class inheritance.
single line commentA comment in the form // This line will be ignored by the compiler.
Single Member District (SMD)(SMD)Single Member Districts are boundaries, within ANCs, developed by the DC City Council.
Single Opt-InA user has subscribed for a newsletter or other email marketing messages by explicitly requesting it.
single point keying[A] means of distributing key to multiple, local crypto-equipment or devices from a single fill point. [INFOSEC-99]
single point of controlA control relationship where the same phase or aspect of a call/service attempt is influenced by one and only one service control function. [T1.667-1999]
single precisionRefers to a level of coordinate accuracy based on the number of significant digits that can be stored for each coordinate.
single sign-onA process that enables a user with a domain account to log on to a network once, using a password or smart card, and to gain access to any computer in the…
Single valuedA property that can hold only one value. See also: property value
Single-AZ DB InstanceA standard (non-Multi-AZ) DB instance that is deployed in one Availability Zone, without a standby replica in another Availability Zone.
single-ended service featureA feature, e.g., call/service attempt manipulation, that applies to only one of the parties that may be involved on a call/service attempt. [T1.667-1999]
single-ended synchronizationSynchronization between two locations, in which phase error signals used to control the clock at one location are derived by comparing the phase of the…
single-frequency (SF) signalingIn telephony, signaling in which dial pulses or supervisory signals are conveyed by a single voice-frequency tone in each direction.
single-frequency interferenceInterference caused by a single-frequency source. Note 1: An example of single-frequency interference is interference in a transmission channel induced by…
single-harmonic distortionOf a fundamental frequency, the ratio of the power of a specified harmonic to the power of the fundamental frequency.
Single-Hop ProblemThe security risks resulting from an mobile software agent moving from its home platform to another platform.
Single-Level DeviceA device that is used to process data of a single security level at any one time.
Single-master operationsActive Directory operations that are single-master, that is, not permitted to occur at different places in the network at the same time.
single-polarized antennaAn antenna that radiates or receives radio waves with a specific polarization. Note: For a singly polarized antenna, the desired sense of polarization is…
single-sideband (SSB) equipment reference levelThe power of one of two equal tones that, when used together to modulate a transmitter, cause it to develop its full rated peak power output.
single-tone interferenceAn undesired discrete frequency appearing in a transmission channel. Note: The single-tone interference frequency is the frequency that appears in the…
SingletA space vehicle, such as a Brilliant Pebble, which contains only one intercept vehicle.
singleton patternA pattern that allows us to ensure that only a single instance of a particular class exists at any one time. Such an instance is called a singleton.
Singular Value DecompositionThe process of breaking down a large database to find the document vector (relevance) for various items by comparing them to other items and documents.
SinkAny process, activity, or mechanism which removes a greenhouse gas, an aerosol, or a precursor of a greenhouse gas or aerosol from the atmosphere.
SiphoningThe use of various means to steal another site's traffic. Techniques used include the wholesale copying of web pages (with the copied page altered…
SIPRIStockholm International Peace Research Institute (Sweden).
SIPRNET(1) Secret Internet Protocol Router Network. (2) Secure Information Protocol Net.
SIPT(1) System Integrated Product Team. (2) Services Integrated Product Team.
SIRa published statutory invention registration contains the specification and drawings of a regularly filed nonprovisional application for a patent without…