A0

A0, A-0, A0, or a0 may refer to: 101 A0 and 103 A0, two versions of the German Heinkel Tourist moped A0 paper size, an international ISO 216 standard paper size (841 × 1189 mm), which results in an area very close to 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 A00, an unofficial paper size twice the size of A0 paper size A-0 Geyser, a geyser in Yellowstone National Park A-0 System, an early compiler-related tool developed for electronic computers L'Avion, IATA airline designator for the French airline Characters of type A0, an older term for algebraic Hecke characters a0, the accepted mathematical symbol for the Bohr radius Haplogroup A00 and A0; see Y-chromosomal Adam and Haplogroup A (Y-DNA) A0, a subdivision in stellar classification A0, sometimes written as 0xA0, is the hexadecimal representation of non-breaking space in various character encoding standards A0 road (Sri Lanka), an A-Grade road in Sri Lanka Bucharest Ring Motorway, The Bucharest Ring Motorway, termed A0

== Airplanes and rockets == A-0, a 1943 Pre-production model of the German Walter HWK 509 liquid-fuel bipropellant rocket engine A-0, a 1938 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 Me 210A-0, a pre-production variant of the 1943 German Messerschmitt Me 210 heavy fighter aircraft