A-0 (Or A0) A language for the or II, using instructions for solving mathematical problems. A-0 was the first language for which a was developed. It was produced by 's team at in 1952. Later internal versions were A-1, A-2, A-3, AT-3. AT-3 was released as . ["The A-2 Compiler System", Rem Rand, 1955]. [Sammet 1969, p. 12]. (1995-12-03)