From The Free On-line Dictionary of Computing (19 January 2023):
SCL
<language> 1. System Control Language.
2. Symbolic Communication Language. Designed primarily for
the manipulation of symbolic formulas. Featured pattern
matching (which was partly the inspiration for SNOBOL), string
operations in buffers, and automatic storage management. "A
Language for Symbolic Communication", C.Y. Lee et al, Tech Mem
62-3344-4, Bell Labs, Sept 1962.