What does Boxing Day have to do with boxing?
(EPL) A PL/I subset dialect by McIlroy, Morris et al, the first running PL/I compiler. It was used by Bell Labs and MIT to write Multics. EPL had extensions to handle the segment/offset nature of Multics pointers.
See also REPL, TMG.
["EPL Reference Manual", Project MAC, April 1966].
[Sammet 1969, p. 542].