Internal Translator definition language, mathematics
(IT) An early compiler
for mathematics developed by A.J. Perlis
et al at Carnegie Tech ca 1957. IT was originally written for the Burroughs 205, then the IBM 650
IT was the forerunner of RUNCIBLE, GATE, CORRELATE and GAT. IT source code was converted to PIT, thence to SPIT.
IT-2 produced machine language directly, IT-3 developed at Carnegie added double-precision floating-point
[Sammet 1969, pp. 139-141].
[CACM 1(5):22 1958].