1. FOrmula CALculator.
An interactive system written by Rick Merrill of DEC
in 1969 for PDP-5 and PDP-8. It was a descendant of AID
Versions: FOCAL-69, FOCAL-1971, FOCAL-11 (for PDP-11
2. Forty-One CAlculator Language.
The programming language of the HP-41 calculator line.