TX

TX can be either:

TX is the telegraphy and CW abbreviation for transmit, also TX Rate for a wireless router.
TX is the United States Postal Service state code for Texas, and domain name as in houston.tx.us
TX is the IATA code for Air Caraibes airline
TX (handheld) is a Palm, Inc. handheld.
TX can mean "thanks" or "thank you" - commonly used in instant messaging
T-X (Terminatrix) is the name of the gynoid antagonist in the movie Terminator 3: Rise of the Machines
The Tsukuba Express, the abbreviation of a railway line of the Metropolitan Intercity Railway Company in Japan
TX (Tug eXperiment) is a fictional space launcher created by Yury Kulchitsky for Orbiter
TV Tokyo - JOTX-TV, JOTX-DTV
Theta Xi is a Greek Fraternity
Tx can mean "therapy" in health care settings