A-0 <language> (Or A0) A language for the {UNIVAC I} or II, using {three-address code} instructions for solving mathematical problems. A-0 was the first language for which a {compiler} was developed. It was produced by {Grace Hopper}'s team at {Remington Rand} in 1952. Later internal versions were A-1, A-2, A-3, AT-3. AT-3 was released as {MATH-MATIC}. ["The A-2 Compiler System", Rem Rand, 1955]. [Sammet 1969, p. 12]. (1995-12-03)