A-0 (or A0) is a programming 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. A-3 was released as ARITH-MATIC; AT-3 was released as MATH-MATIC.


The A-2 Compiler System, Rem Rand, 1955.
PROGRAMMING LANGUAGES: History and Fundamentals, Sammet 1969, p. 12

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For "A0" the ISO 216 specification for paper, see paper size.