ua; UAN; UART; UAT; UAW; UBASIC; UBD; ubiquitous computing; uC++; UCB; UCHO; U-Code; UCP; UCS; UCSD Pascal; UCS transformation format; UCX; udb; UDDI; UDF; UDMA; UDP; uemacs; UFO; UFO bug; ug; UGLIAC; UHELP; UI; uid; UIDL; UIL; UIMS; UIMX; UIS; uk; UKC; UKERNA; UKUUG Ltd.; ULCC; Ulm's Modula-2 System; ULP; Ultra64; Ultra-ATA; Ultra DMA; Ultra-SCSI; Ultrix; um; UMB; UMB Scheme; UMDL; UML; uML; UMTS; unary; UNC; UNCL; UNCOL; uncompression; uncountable; uncurry; uncurrying; undefined; undefined external reference; underflow; Undernet; underscore; under the hood; undocumented feature; U-NET Limited; unfold; unfold/fold; UNI; unicast; Unicode; UniCOMAL; Unicorny; unicos; Uniface; unification; Unified Han; Unified Modeling Language; unifier; UNIFORM; Uniform Naming Convention; Uniform Resource Citation; Uniform Resource Locater; Uniform Resource Locator; Uniform Resource Name; Uniform Resource Number; Unify; unify; Unify Corporation; Unihan; uninstaller; uninteresting; Uninterruptible Power Supply; union; Unipalm Group plc; Unipress Software, Inc.; uniprocessor; UNIQUE; Unique ID Listing; unique key; unique sales point; Unir Tech; UNISAP; Unisys Corporation; United Kingdom Unix Users Group; United Technologies Research Cente; Unit Separator; unit testing; UNITY; Univac; Universal algebra; Universal Asynchronous Receiver/Transmitter; Universal Character Set; Universal Communications X; Universal Computer Protocol; Universal Debugger; Universal Description, Discovery, and Integration; Universal Disk Format; Universal Naming Convention; universal quantifier; Universal Resource Identifier; Universal Resource Locator; Universal Serial Bus; universal thunk; Universal Time; Universal Time Coordinated; universe of discourse; University of Arizona; University of California at Berkeley; University of Durham; University of East London; University of Edinburgh; University of Hawaii; University of Iceland; University of London Computing Centre; University of Michigan; University of Michigan Digital Library Project; University of Minnesota; University of Nijmegen; University of Pennsylvania; University of Tasmania; University of Twente; Unix; Unix box; Unix brain damage; Unix conspiracy; Unix International; Unixism; Unix man page; Unix manual page; Unix System V; Unix to Unix Copy; UnixWare; Unix weenie; Unix wizard; Unlicense; unnormalised; unproto; unshar; unshielded twisted pair; unswizzle; until; untyped; unwind-protect; unwind the stack; UN*X; unzip; up; uparrow; UPenn; upgradability; upgrade; upgradeability; upload; UPMAIL Tricia Prolog; upper bound; Upper Layer Protocol; upper memory block; Upper Side-Band modulation; Upright Database Technology AB; UPS; upstream; upthread; upward closure; Uranus; urban legend; URC; urchin; URI; URL; URL forwarding; URL redirection; URN; URouLette; US; us; usability; USAModSim; usa.net; US-ASCII; USB; USB 2.0; USB Adapter Card Support; USB drive; USE; Usenet; Usenet news; Usenetter; USENIX; user; user acceptance testing; user base; User Brain Damage; User Datagram Protocol; user-friendly; user id; user identifier; user interface; user interface copyright; User Interface Language; user name; User Network Interface; user-obsequious; user-unctuous; Use the Source Luke; USG Unix; usim; USL; USP; USR; usr; US Robotics; U.S. Robotics, Inc.; USSA; UTC; UTF; UTF-8; utility; utility-coder; utility program; utility software; UTOPIST; UTP; UTRC; UTSL; uucp; UUCPNET; uudecode; uuencode; UUNET PIPEX; UUPC; uy; uz;