Editing A0

{{distinguish|text=[[AO (disambiguation)|AO]] (A followed by a capital O)}}
'''A0''', '''A-0''', '''A<sub>0</sub>''', or '''a<sub>0</sub>''' 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&nbsp;mm), which results in an area very close to 1 m<sup>2</sup>
* [[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 opening]]s 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 A<sub>0</sub>, an older term for algebraic [[Hecke character]]s
* ''a''<sub>0</sub>, 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

== Submarine ==
* ''[[Isaac Peral]]'' (A-0), a Spanish submarine

== See also ==
* [[AO (disambiguation)]]
* [[0A (disambiguation)]]

{{Letter-Number Combination Disambiguation}}