AT may mean:

• AT Field is a force field in the anime Neon Genesis Evangelion
• Acceptance test
• Aero triangulation
• Alimentary tract
• Anaerobic threshold
• Análise Transacional (Transactional analysis) - método psicológico
• Anti-tank weapons
• Anti-Terrorism
• Appalachian Trail
• Appropriate Technology
• Ashmore and Cartier Islands (FIPS 10-4 territory code and obsolete NATO digram)
• Assistive technology
• IBM Personal Computer/AT
  • AT form factor for motherboards and computer cases
  • The common name for the 5-pin DIN keyboard connector
• The county code for Atchison County, Kansas
• Attention, part of the Hayes command set for modems
• Audit trail
• Austria (ISO 2-letter country code)
• Auto Trend
• Automatic transmission
• Royal Air Maroc (IATA code)

At may mean:

• the symbol for the Ampere-turn, an MKS unit of magnetomotive force
• the chemical symbol for the chemical element astatine (At)
• a subdivision equal to 1/100 of a Kip, the unit of currency in Laos

aT may mean

• the symbol for the atto tesla, an SI unit of magnetic flux density

at may mean

• the punctuation symbol, "@", now principally used in e-mail addresses
• at Unix command, to schedule tasks to be performed at a later date
• the symbol for the physical unit of the technical atmosphere
• an indication of position, time, target or state
• .at the ccTLD for Austria

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