AT
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AT or at may stand for:
- acceptance test
- AT form factor for motherboards and computer cases, in IBM PC
- aero triangulation
- alimentary tract
- anaerobic threshold
- anti-tank
- anti-terrorism (see also: counter-terrorism)
- Appalachian Trail
- assistive technology
- astatine (At), chemical symbol for the chemical element
- 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
- technical atmosphere
- audit trail
- Austria (ISO 3166-1 alpha-2 country code)
- automatic transmission
- the IATA code for Royal Air Maroc
- The Old 5-pin connector used on ibm at computers