AT1

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AT1 , AT 1 or AT ₁ stands for:

Eastern Austria (NUTS: AT code), Austrian NUTS 1 region
Prussian AT 1 (also: AT ₁ ), Prussian three-axle accumulator railcar
Angiotensin II receptor type 1 , angiotensin II receptor type 1, see angiotensin II receptor # AT1 receptor (also: AT ₁ receptor)

AT-1 stands for:

Group of federal states (NUTS: AT code), Austrian regions of the European Community
Burgenland (ISO-3166-2: AT-Code), Austrian federal state
AT-1 Snapper (Nato code name), Soviet anti-tank missile complex 2K15 Schmel