1. FORmula CALculatOR. An interactive system written by Rick Merrill of DEC in 1969 fORPDP-5 and PDP-8. It was a descendant of AID/JOSS. Versions: FOCAL-69, FOCAL-1971, FOCAL-11 (fORPDP-11 under RT-11). (1994-12-21) 2. FORty-One CAlculatOR Language. The programming language of the HP-41 calculatOR line. (1994-12-21)