A0

A0 may refer to:

• 101 A0 and 103 A0, two versions of the German Heinkel Tourist moped
• A0, an international ISO 216 standard paper size (841 × 1189 mm), which results in an area of 1 m²
• A0 highway (Zimbabwe), a highway which orbits Zimbabwe
• A0, the lowest A (musical note) note on a standard piano
• A0, a climbing grade
• A00, Irregular chess openings code in the Encyclopaedia of Chess Openings
• A-0, a 1943 Pre-production model of the German Walter HWK 109-509 liquid-fuel bipropellant rocket engine
• A-0 Geyser, a geyser in Yellowstone National Park
• A-0 System, the first compiler ever developed for an electronic computer
• A-0, a variant of the German Siebel Si 204 transport and trainer aircraft
• He 177 A-0, a pre-production series of the 1942 German Heinkel He 177 heavy bomber
• Hs 126A-0, a variant of the 1937 German Henschel Hs 126 reconnaissance aircraft
• Ju 87 A-0, a variant of the 1936 German Junkers Ju 87 dive bomber aircraft
• L'Avion, IATA airline designator for the French airline
• Me 210A-0, a pre-production variant of the 1943 German Messerschmitt Me 210 heavy fighter aircraft

a₀

• a₀, the accepted mathematical symbol for the Bohr radius

See also

• AO (disambiguation)

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