2. UAPITA (You’re a pain in the ass)
3. UART (Universal Asynchronous Receiver/Transmitter)
4. UBE (Unsolicited Bulk E-mail)
5. ubiquitous computing
6. UBR (Unspecified Bit Rate)
7. Ubuntu
8. UCC (Uniform Code Council)
9. UCD (User-Centered Design)
10. UCE (Unsolicited Commercial E-mail)
11. UCP (Universal Communications Platform)
12. UCS (Universal Character Set)
13. UCS/WINS (Uniform Communication Standard)
14. UDA (Universal Data Access)
15. UDDI (Universal Description, Discovery and Integration)
16. UDF (Universal Disk Format)
17. UDMA (Ultra DMA)
18. UDP (User Datagram Protocol)
19. UEFI (Unified Extensible Firmware Interface)
20. UHF (Ultra High Frequencies)
21. UI (User Interface)
22. UICC (Universal Integrated Circuit Card)
23. UID (User ID, User Identifier)
24. ULS (User Location Service) server
25. Ultra ATA
26. Ultra SCSI
27. UltraNav
28. ULTRIX
29. UMB (Upper Memory Block)
30. UML (Unified Modeling Language)
31. UMM (UN/CEFACT Modelling Methodology)
32. UMPC (Ultra Mobile Personal Computer)
33. UMTS (Universal Mobile Telecommunications System)
34. UN/CEFACT (United Nations Centre for Trade Facilitation and Electronic Business)
35. UN/EDIFACT (United Nations rules for Electronic Data Interchange for Administration, Commerce and Transport)
36. UNC (Universal or Uniform Naming Convention)
37. unconditional jump
38. unicast
39. Unicode
40. UNII (Unlicensed National Information Infrastructure)
41. union (1)
42. union (2)
43. union (3)
44. UniPress Emacs
45. unique visitors
46. UnitedLinux
47. UNIVAC I (UNIVersal Automatic Computer I)
48. UNIX
49. UNIX socket
50. UNIX compress
51. UNIX System V Release 4.0
52. Unix-like operating system
53. UnixWare
54. unparsed entity
55. unsigned integer
56. unsigned number
57. unstructured overlay network
58. unzip
59. update
60. upgrade
61. uplink (1)
62. uplink (2)
63. upload
64. UPnP (Universal Plug and Play)
65. UPS (Uninterruptible Power Supply)
66. upstream
67. uptime
68. UPX (Ultimate Packer for eXecutable)
69. URI (Uniform Resource Identifier)
70. URL (Uniform Resource Locator)
71. URN (Uniform Resource Name)
72. usability
73. USB (Universal Serial Bus)
74. USB 2.0 (Universal Serial Bus 2.0)
75. USB drive (1)
76. USB drive (2)
77. USB drive (3)
78. USB flash drive
79. USB keyboard
80. USB Mass Storage
81. USB OTG (USB On The Go)
82. USB port
83. Usenet (User Network)
84. user
85. user account
86. user agent
87. user friendliness
88. user ID
89. user plane
90. user session
91. user sessions
92. user-level security
93. username
94. USIM (Universal Subscriber Identity Module)
95. UTF (Universal Transformation Format)
96. UTF-8 (8-bit UCS/Unicode Transformation Format)
97. utility
98. uTLD (unsponsored Top-Level Domain)
99. UTP (Unscreened Twisted Pair)
100. UTRAN (UMTS Terrestrial Radio Access Network)
101. UUcoding
102. UUCP (Unix-to-Unix Copy Protocol)
103. uuencode
104. uuencoding (Unix to Unix Encoding)
105. UUNET (UNIX to UNIX Network)
106. UW (You’re welcome)
107. UWC (Universal Wireless Consortium)
108. UXGA (Ultra Extended Graphics Array)