From The Free On-line Dictionary of Computing (19 January 2023):
SIL
1. "SIL - A Simulation Language", N. Houbak, LNCS 426,
Springer 1990.
2. SNOBOL Implementation Language. Intermediate language
forming a virtual machine for the implementation of portable
interpreters.
["The Design of Transportable Interpreters", F. Druseikis,
SNOBOL4 Project Document S4D49, U Arizona (Feb 1975)].
Version 3.11. (ftp://cs.arizona.edu/snobol4/). E-mail:
<snobol4@arizona.edu>.
(1986-07-29)