Technology terms starting with U

395 terms

  1. undisturbed day A day during which neither sunspot activity nor ionospheric disturbance causes detectable interfere with radio communications.
  2. undo check-out Cancel the check-out of a document. Undoing a check-out returns the document to the state it was before the check-out.
  3. unequipped indication A code placed in unequipped channels by originating equipment to indicate to path terminating equipment that the channel is intentionally unoccupied so…
  4. Unethical SEO Unethical search engine optimization techniques that are considered unscrupulous and can result in getting sites banned from the search engines.
  5. unexpected frame A valid frame that cannot be processed. The frame itself is perfectly legitimate.
  6. Unicode A 16-bit character set designed to make it easier to exchange and display information that makes use of a wide range of different languages and symbols.
  7. Unicode-based white space segmentation A method of tokenization that uses Unicode character properties to distinguish between token and separator characters.
  8. UNICOM station Synonym aeronautical advisory station.
  9. UNID (Universal ID) A unique 16-byte value that is assigned to a note when the note is first created.
  10. UNID table The UNID table maps a note's UNID to its note ID, which, in turn, can be mapped through the database's RRV table to the note's position within the…
  11. unidirectional The condition where information flow is provided only in one direction. [T1.615-1992]
  12. unidirectional channel Synonym one-way-only channel.
  13. unidirectional operation Operation in which data are transmitted from a transmitter to a receiver in only one direction.
  14. unidirectional path A path that logically connects a single path source with the associated path sink. [T1.231-1997]
  15. Unified Action Armed Forces A publication setting forth the principles, doctrines, and functions governing the activities and performance of the Armed Forces of the United States…
  16. Unified Block and File Architecture The ability of Adaptec's iSCSI-enabled GuardianOS Snap Servers to store block and file data simultaneously on a single storage device.
  17. Unified Command A command with a broad continuing mission under a single commander and composed of significant assigned components of two or more Services, and which is…
  18. Unified Messaging An application that consolidates a user's voice mail, fax, and e-mail into one mailbox, so that the user only needs to check a single location for…
  19. Unified Messaging server role A set of components and services that enable voice, fax, and e-mail messages to be stored in a user's single mailbox.
  20. uniform encoding An analog-to-digital conversion process in which, except for the highest and lowest quantization steps, all of the quantization subrange values are equal.
  21. uniform linear array An antenna composed of a relatively large number of usually identical elements arranged in a single line or in a plane with uniform spacing and usually…
  22. uniform quantizing Synonym uniform encoding.
  23. Uniform Resource Identifier A character string used to identify a resource (such as a file) from anywhere on the Internet by type and location.
  24. Uniform Resource Locator (URL) An address that specifies a protocol (such as HTTP or FTP) and a location of an object, document, World Wide Web page, or other destination on the…
  25. uniform time scale A time scale made up of equal intervals.
  26. uniform transmission line A transmission line that has distributed electrical properties, i.e., resistance, inductance, and capacitance per unit length, that are constant along the…
  27. uniform-spectrum random noise See white noise.
  28. unilateral control system Synonym unilateral synchronization system.
  29. unilateral synchronization system A system of synchronization in which signals from a single location are used to synchronize clocks at one or more other locations.
  30. unimode fiber Synonym single-mode optical fiber.
  31. uninitialized variable A local variable that been declared, but has had no value assigned to it. The compiler will warn of variables which are used before being initialized.
  32. unintelligible crosstalk Crosstalk that consists of unintelligible signals, hence from which information cannot be derived.
  33. unintentional interference See interference.
  34. uninterruptible power supply (UPS) Backup power supply that is available when the electrical power fails or drops to unacceptable levels.
  35. Union An organization of workers formed for the purpose of collective bargaining.
  36. unipolar signal A two-state signal where one of the states is represented by voltage or current and the other state is represented by no voltage or current.
  37. Uniprocessor (UP) A single-processor architecture. See also Symmetric Multiprocessor (SMP).
  38. unique key Key held only by one crypto-equipment and its associated distribution center.
  39. unique stream A stream whose connection speed, media type, or thinning parameters are different from another stream that is part of the same streaming media…
  40. Unique Visitor A real visitor to a web site. Web servers record the IP addresses of each visitor, and this is used to determine the number of real people who have…
  41. Unique visitors Unique visitors are a count of individual users who have accessed your web site.
  42. UNISYS UNISYS Corporation.
  43. Unit An amount of a bet.
  44. unit element In the representation of a character, a signal element that has a duration equal to the unit interval.
  45. unit impulse A mathematical artifice consisting of an impulse of infinite amplitude and zero width, and having an area of unity.
  46. unit interval In isochronous transmission, the longest interval of which the theoretical durations of the significant intervals of a signal are all whole multiples.
  47. unit-distance code An unweighted code that changes at only one digit position when going from one number to the next in a consecutive sequence of numbers.
  48. United States Army Space Command (USARSPACE) The Army component command of USSPACECOM. Responsible for the Army elements of the SDS system. Located in Colorado Springs, CO.
  49. United States Federal Geographic Data Committee (FGDC) Composed of representatives of several federal agencies and GIS vendors, the FGDC has the lead role in defining spatial metadata standards, which it…
  50. United States Space Command (USSPACECOM) The unified command responsible for planning and conducting ballistic missile defense. Located in Colorado Springs, CO.
  51. United States Strategic Command (USSTRATCOM) The DoD unified command responsible for carrying out directed nuclear and nonnuclear strategic air, intercontinental ballistic missile, and sea-launched…
  52. United States Transportation Command (USTRANSCOM) The DoD unified command responsible for providing air, land, and sea transportation for the Department of Defense, both in time of peace and time of war.
  53. Uniting and Strengthening America by Providing Appropriate Tools Required to Intercept and Obstruct Terrorism Act of 2001 A U.S. federal law that expands the authority of U.S. law enforcement for the stated purpose of fighting terrorist acts in the United States and abroad.
  54. Universal Description, Discovery and Integration (UDDI) project An industry initiative to create a platform-independent, open framework for describing services, discovering businesses, and integrating business services…
  55. universal digital loop carrier A digital loop carrier (DLC) that uses a central office terminal (COT). [T1.216-1998]
  56. Universal Personal Telecommunications (UPT) service A telecommunications service that provides personal mobility and service profile management.
  57. universal personal telecommunications number Synonym UPT number.
  58. universal restrictions Universal restrictions are given the symbol ∀. They constrain the relationships along a given property to individuals that are members of a specific…
  59. universal service The concept of making basic local telephone service (and, in some cases, certain other telecommunications and information services) available at an…
  60. Universal Standard Products and Services Classification (UNSPSC) A schema that classifies and identifies commodities. It is used in sell-side and buy-side catalogs and as a standardized account code in analyzing…
  61. Universal Time (UT) By international agreement, the local time at the prime meridian, which passes through Greenwich, England.
  62. Universally Unique Identifier (UUID) Identifier that is immutable and unique across time and space.
  63. Universe In the world of investments, the word universe refers to a specific group or category of investments that share certain characteristics.
  64. universe polygon The first record in a polygon attribute table. It represents the area beyond the outer boundary of the coverage.
  65. UNIX A software operating system.
  66. UNIX cred The credential used to validate requests when accessing files with UNIX-style security.
  67. UNIX permissions The bits used in UNIX-style security to control access to files and directories.
  68. Unk Unknown.
  69. unmount To make the file system on a particular device inaccessible by detaching it from the file hierarchy.
  70. unnamed package All classes defined in files without a package declaration are placed in the unnamed package.
  71. unnumbered command In a data transmission, a command that does not contain sequence numbers in the control field.
  72. unnumbered information (UI) frame A frame used to transfer unacknowledged information between two link layer entities. The format and encoding are the same as specified in Recommendation 0.
  73. unnumbered response In data transmission, a response that does not contain sequence numbers in the control field.
  74. unpark A function performed by the network if a call remains parked longer than a predesignated time limit, or if the parked party disconnects. [T1.653-1996]
  75. unparsed entity A general entity that contains something other than XML. By its nature, an unparsed entity contains binary data.
  76. unprivileged subject A subject without appropriate privileges to perform an operation [POSIX.6].
  77. Unreachable queue A persistent queue that contains messages that cannot be routed to their destinations.
  78. Unresolved Objects Objects so closely spaced with respect to the sensor focal plane as to be indistinguishable from a single object.
  79. UNSC United Nations Security Council.
  80. unscheduled records Records for which no retention period ("schedule") has yet been determined
  81. unseal For BitLocker Drive Encryption, the process that a Trusted Platform Module (TPM) uses to decrypt data in a sealed binary large object (BLOB) to reveal the…
  82. UnSecEnergy Under Secretary of Energy.
  83. unshielded twisted pair (UTP) A type of wire generally used for telephone and network cabling.
  84. Unsigned data Data included in an authentication token, in addition to a digital signature.
  85. unstructured text Text for which no internal structure is defined and is unambiguously understood by a typical user [POSIX.6].
  86. unsuccessful call Synonym unsuccessful call attempt.
  87. unsuccessful call attempt A call attempt that does not result in the establishment of a connection. Synonym unsuccessful call.
  88. Unsupervised clustering Unsupervised clustering provides grouping of related documents on the basis of their content without referring to a taxonomy; it creates a…
  89. untrusted process [A] Process that has not been evaluated or examined for adherence to the security policy.
  90. unused character Synonym illegal character.
  91. unwanted current With respect to telecommunications plant, any current that is not intentionally supplied from the central office or from telephone equipment. [After T1.
  92. unwanted voltage With respect to telecommunications plant, any voltage that is not intentionally supplied from the central office or from telephone equipment. [After T1.
  93. UOC Usable on Code (ILS term).
  94. UOES See User Operational Evaluation System.
  95. up-converter A device that translates frequencies from lower to higher frequencies.
  96. upcast A cast towards an object's ultimate super type - that is, `up' the inheritance hierarchy towards the Object class, for instance // Upcast from…
  97. UPD Unconventional Passive Discrimination.
  98. update The process through which search crawls content and compiles an index of the content.
  99. Update (a Certificate) The act or process by which data items bound in an existing public key certificate, especially authorizations granted to the subject, are changed by…
  100. update site The standard Eclipse directory containing feature and plug-in JAR files and the site index.