| Term | Definition |
|---|
| Trojan horse | A special program that hides inside another program. Eventually, when the main program is run, the Trojan horse program might delete files, display a message, or copy data to an external computer. |
| True color | Humans can distinguish about 16 million colors. Devices that can display that many colors are said to display true color. It requires the device to use 3 bytes (24 bits) for each pixel. |
| Turing test | A test proposed by Alan Turing in which a machine would be judged "intelligent" if the software could use conversation to fool a human into thinking it was talking with a person instead of a machine. |
| Twisted-pair cable | Common dual-line wire. Often packaged as three or four pairs of wires. The cable can be run for only a limited distance, and the signal is subject to interference. |
| Typeface | A defined way to draw a set of text characters. Several thousand typefaces have been created to meet different artistic and communication needs. A common characterization is serif and sans serif typefaces. |
| Unicode | An international standard that defines character sets for every modern (living) language, and many extinct languages (e.g., Latin). |
| Uninterruptable power supply (UPS) | A large battery and special circuitry that provides a buffer between the computer and the power supply. It protects the computer from spikes and brownouts. |
| UNIX | A popular operating system created by Bell Labs. It is designed to operate the same on hardware from several different vendors. Unfortunately, there are several varieties of UNIX, and software that operates on one version often must be modified to function on other machines. |
| Unstable model | A model that cannot be solved for a single solution. The solution might continually diverge, or it could oscillate between several alternatives. Generally due to insufficient or incorrect feedback mechanisms. |
| Upload | To transfer files from a local computer (usually a personal computer) to a distant computer. |
| Usenet | a bulletin board on internet wherein you can blog about what you feel and your hapennings in life and for each post of bulletin, people in that site may give comment about you post.(e.g. Friendster bulletin) |
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