(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 aSMATH-MATIC. ["The A-2 Compiler SyStem", Rem Rand, 1955]. [Sammet 1969, p. 12]. (1995-12-03)