Main Page | See live article | Alphabetical index AT or at may stand for: acceptance test Advanced Technology, in IBM PC AT aero triangulation alimentary tract anti-terrorism (see also: counter-terrorism) astatine (At), chemical symbol for the chemical element at commercial at: the punctuation symbol "@", now principally used in e-mail addresses. ATtention, part of the Hayes AT command set for modems at (Unix command) to schedule tasks to be performed at a later date audit trail Austria (ISO country code) automatic transmission See also: wiktionary:at This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.