- You may have been looking for arithmetic, a branch of mathematics.
ARITH-MATIC is an extension of Grace Hopper's A-2 programming language, developed around 1955. ARITH-MATIC was originally known as A-3, but was renamed by the marketing department of Remington Rand UNIVAC.
Some ARITH-MATIC subroutines 
||The A in the middle of 'AA0' stands for addition
||The S in the middle of 'AS0' stands for subtraction
||The M in the middle of 'AM0' stands for multiplication
||The D in the middle of 'AD0' stands for division
||The S in the middle of 'TS0' stands for Sin
||The C in the middle of 'TC0' stands for Cos
||The T in the middle of 'TT0' stands for Tan
||The AT stands for Arctan
||The S in the middle of 'HS0' stands for Sin h
||The C in the middle of 'TC0' stands for Cos h
||The T in the middle of 'TT0' stands for Tan h
This article is based on material taken from the Free On-line Dictionary of Computing prior to 1 November 2008 and incorporated under the "relicensing" terms of the GFDL, version 1.3 or later.