UART
Universal Asynchronous Receiver/Transmitter. A chip that controls the data received and sent via a serial port. 16550 UART is common and it supports data transfer up to 57.6 kbps.
UBB
Ultimate Bulletin Board. UBB covers the range of message board products made by InfoPop.com. UBB premiered in 1996, is PERL-based, can be hosted (UBB.x) or installed on a Unix, Linux, or Windows  (UBB.classic and UBB.threads). Users of UBB message boards may be oblivious to the UBB except for UBBCode.
UBBCode
UBBCode is used on UBB base message boards. UBBCode uses HTML-like tags to achieve HTML-like functionality. Here are typical examples of UBBCode:
http://www.yourURL.com
www.yourURL.com
[url=http://www.infopop.com]infopop.com[/url]
[url]http://www.infopop.com[/url]
[email]info@test5324566.com[/email]

Hello, [b]James[/b] : BOLD
Hello, [i]Mary[/i] : ITALICS

[list]
[*] This is the first bulleted item.
[*] This is the second bulleted item.
[/list]
Making ordered lists is just as easy.
Just add either [LIST=A] or [LIST=1].
Typing [List=A] will produce a list from A to Z.
Using [List=1] will produce numbered lists.

[img]http://www.infopop.com/artwork/footer_logotype.gif[/img]

[CODE]
#!/usr/bin/perl

print "Content-type: text/html ";
print "Hello World!";
[/CODE]

You must not use both HTML and UBBCode™ to do the same function.
Also note that the UBBCode™ is not case-sensitive
(thus, you could use [URL] or [url]).

Incorrect UBBCode™ Usage:
[url] www.infopop.com [/url]
- don't put spaces between the bracketed code and
the text you are applying the code to.
[email]info@test9342J.com[email]
- the end brackets must include a forward slash ([/email])
UCS
Universal Character Set. See Unicode.
UDA
Universal Data Access. Microsoft's architecture for accessing data. UDA is compatible with MS Transaction Server, MS Studios, MS Office, DHTML, and ASP. UDA relies on heavily on OLEDB, ADO, and ODBC to implement access to all kinds of data.
UDDI
Universal Description and Discovery Integration. UDDI is a standard with an XML based global registry that helps lists Web Services so they can be located by Web Service consuming applications --much like a Yellow Pages. See also Web Services.
UDP
User Datagram Protocol. A communication protocol similar to TCP (Transmission Control Protocol), except that it does not divide data into packets, reassemble packets, or sequence packets. UDP/IP is analogous to TCP/IP. UDP is good for very small data units. Note that just as TCP is used in FTP (File Transfer Protocol), UDP is used in TFTP (Trivial File Transfer Protocol).
UIUC
University of Illinois at Urbana Champaign.
UML
Unified Modeling Language. A notation system/language for discussing the development, design, and analysis of object-oriented models for solving programming projects. The UML is an OMG standard based upon works by Grady Booch (The Booch Method), James Rumbaugh (Object Modeling Technique), and Ivar Jacobson (Use Case Methodology). UML is endorsed by many major software companies including IBM and Microsoft.

UML helps to describe classes of objects, association, responsibility, activity, interface, use case, package, sequence, collaboration, and state.

See stuff like http://www.omg.org/technology/documents/formal/uml.htm.
unary
A function or operator that has one argument. See also nullary, binary, and ternary.
UNC
Universal Naming Convention. A cross-platform convention for specifying servers, directories, files, and other resources on a network. This usual format is as follows:
\\server\share\path\resource
\\someserver\c$ See also path. Unicode ISO-1064-6. Aka UCS (Universal Character Set). Unicode provides a unique # for every character, regardless of platform, program, or language. Unicode uses 2 bytes (16 bits) to provide 2^15 or 32,768 possible characters. The first 7 bits are still ASCII, the 8th bit is still used for parity. Unicode is the modern character set established in 1993 by a consortium of companies including Apple, Microsoft, HP, Digital and IBM. Unicode is a super-superset of ISO Latin 1 and not of ANSI! (Nyahh, nyahh Microsoft!) Unicode encompasses the worlds major living languages, symbols used in the sciences, and characters from dead languages of scholastic interest. See also my section on Character Codes. See also www.unicode.org. Unified Modeling Language See UML. Uniform Resource Identifier See URI. Uniform Resource Label See URL. Uniform Resource Name See URN. Uninterrupted Power Supply See UPS. Universal Asynchronous Receiver/Transmitter See UART. Universal Character Set UCS. See Unicode. Universal Data Access See UDA. Universal Description and Discovery Integration See UDDI. Universal Naming Convention See UNC. Universal Serial Bus See USB. Universal Time Coordinate See UTC. UNIX A multi-user, multitasking, multiplatform, mature OS originated by Ken Thompson at AT&T (now USL). UNIX is platform independent and can be installed on nearly any kind of machine. See also my section on UNIX-Linux. Unshielded Twisted Pair See UTP. upper memory The next 384 kB of RAM after conventional memory in older PCs under DOS. Upper memory was reserved for hardware devices such as network cards and monitors. UPS Uninterrupted Power Supply. A device that can go between a system and its power source so that the UPS can provide backup power in case the usual power source goes down. UPSs also usually act as line conditioners and protect against spikes and noise in the power delivery. Sometimes Windows NT may shutdown a UPS when booting up. In this case the NO SERIAL MICE switch must be used in the BOOT.INI file. URI Uniform Resource Identifier. A generic term for all kinds of names and addresses that are strings and refer to objects on the Web. A URI is usually either a URL (Uniform Resource Locator) or URN (Uniform Resource Name). URLs define location and name, whereas URNs usually just identify a name. EG: http://www.google.com is a URI, while urn:ISBN:0451450523 is a URN. The general form for a URI is Scheme : First / Second ; Third ? Fourth The following characters are reserved for URIs: ; / ? : @ & = +$ ,
Note that encodeURI(), decodeURI(), encodeURIComponent(), and decodeURIComonent() of JS 1.5 do not consider ; to be a URI reserved character and therefore will encode it. Note also that URLs for HTTP also frequently make use of the # character for anchors (bookmarks).

URL
Uniform Resource Locator. A kind of URI. An address (name) that leads to a file, a file portion, an E-mail account, or a terminal session. Its syntax consists of the protocol (scheme), authority (with possible username, password, host name, domain name, top-level domain name, port number), path (with possible filename), querystring (with parameters), and anchor (bookmarks).
scheme://authority/path?querystring#anchor scheme://user:password@host.domain.tld:port/path/file?param1=a&param2=b#bookmark
EG:
http://john:secret@sub.pets.com:80/dogs/terriers.htm?sex=M&dob=20050801#section2
file:///C:/Temp/test.txt
jdbc:datadirect:oracle://someserver:1521;sid=fakedb

URL Portion Common Values
protocols file
mailto
ftp
http
gopher
news
telnet
wais
host name www search
domain name microsoft
apple
yahoo
zdnet
top-level domain name com
net
org
int (international)
edu
gov
mil (US military)
ge (Germany)
port  7 echo
13 daytime
17 qotd (Quote of the day)
21 ftp
23 telnet
25 smtp
37 time
42 nameserver
43 nicname (whois)
70 gopher
79 finger
80 http
110 pop3
119 nntp
path subdir images
file index.htm default.htm
URN
Uniform Resource Name. A kind of URI that uses the "urn" scheme.

(1) An URI that has an institutional commitment to persistence, availability, etc. Note that this sort of URI may also be a URL.

(2) A particular scheme, urn:, specified by RFC2141 and related documents, intended to serve as persistent, location-independent, resource identifiers. URNs are often used with namespaces. EG: urn:example.microsoft.com:BookInfo.
USB
Universal Serial Bus. An upcoming upgrade on ADB but able to connect over 100 peripherals to one port. It should provide hot-swappable, Plug-and-Play connections as high as 12 Mb/s. It should replace the Mac's and the PC's serial, parallel, keyboard, and mouse ports.USB 2 specifications were released in 2000 April. USB 2 is backwards compatible with USB 1 but supports 480 Mb/s which is even faster than Firewire! USB OTG (USB On-The-Go) is an extension on USB that allows USB devices to communicate with each other without being connected to a computer.
USENET
USEr NETwork. Aka newsgroup. Thousands of newsgroups accessible via the Internet. Some newsgroup servers carry only a subset of the available newsgroups. Each newsgroup consists of e-mails related to its particular topic that can be posted and read by anyone. Some newsgroups are monitored and only allow content they consider acceptable.

USENET servers utilize NNTP to handle the communications between itself and the newsgroup clients. Some sites give web access to USENET newsgroups.

Except for posting of binaries (EGs: pictures, videos, and audio), Usenet has effectively moved to Groups.Google.com. A quick link can be made to a newsgroup at Google by using this syntax: http://groups.google.com/groups?group=newsgroup. EG: http://groups.google.com/groups?group=comp.lang.javascript.
user
A person who uses a computer.
User Datagram Protocol
See UDP.
A set of characters chosen by the user to gain entry into certain networks or programs. It is usually used in conjunction with a longer password. Usernames and password are probably the main form of security on networks. Try to pick something short and sweet and try to be consistent with upper and lower case letters.
user software
Software, eg a word processor, which actually performs the tasks the user needs as opposed to operating system software.
UTC
Universal Time Coordinate. Aka Greenwich Mean Time. The time in Greenwich. GMT is the reference time for all other time zones by international standard. EG: CST (Central Standard Time), the time zone that Chicago is in, is 6 hours behind GMT, i.e. when it is 3 PM in Chicago, it is 9 PM in London.
UTF
UCS Transformation Format. Unicode Transformation Format. A UTF is an algorithmic mapping from every Unicode scalar value to a unique byte sequence. Different versions of UTF include: UTF-1, UTF-2, UTF-7, UTF-8, UTF-16, UTF-16BE, UTF-16LE, UTF-32, UTF-32BE, UTF-32LE. UTF-8, co-created in 1992 by Ken Thompson and Rob Pike, is the most popular since it is great for both web pages and Unix/Linux systems. See also my section on Character Codes.
UTP
See 10BASE-X and media.
UUCP
Unix to Unix Copying Program. A type of program that copies files between UNIX systems. It was developed in Bell Labs in 1976. UUCP protocols are often used to transfer data on Usenet.
uuencoded
Unix-to-Unix-Encoded. A format for transferring files over e-mail and Usenet newsgroups. This format breaks the file down into several smaller sub-files since the some Internet systems have limitations on the size of individual files. Each sub-file may have headers or footers that are generally ignored. The body of the sub-files are formatted in the following fashion:

Each sub-file is sequentially named (EG:  file2.uu1, file1.uu2, etc.). The first sub-file in the series begins with a line that looks like begin 660 filename.jpg or begin 644 filename.gif. That line is then followed by multiple lines that begin with the letter M and are 61 characters long.

Subsequent sub-files are also multiple lines that begin with the letter M and are 61 characters long. The third to the last line of the last sub-file begins with the letter M but may contain less than 61 characters. The second to the last line of the last sub-file contains a single character, the back quote (). The last line of the last sub-file contains three characters: end.
UUID
Universal Unique IDentifier. A number used to uniquely identify type libraries on Windows OS. EG: The following code can be inserted in the global.asa file of an ASP application so that ADO constants can be used: <!--metadata type="TypeLib" name="Microsoft ActiveX Data Objects 2.5 Library" UUID="{00000205-0000-0010-8000-00AA006D2EA4}"-->.  In this example, an alternative to using a UUID would be to use the path to the type library's file: <!-- metadata type="typelib" file="c:\program files\common files\system\ado\msado15.dll"-->`.

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