The Free On-line Dictionary of Computing (19 January 2023):

EOL

   1. End Of Line.

   2. Expression Oriented Language.  A low-level language for
   strings. Versions: EOL-1, EOL-2, EOL-3.  ["EOL - A Symbol
   Manipulation Language", L. Lukaszewicz, Computer J 10(1):53
   (May 1967)].

   [Jargon File]


The Jargon File (version 4.4.7, 29 Dec 2003):

EOL
 /E·O·L/, n.

    [End Of Line] Syn. for newline, derived perhaps from the original CDC6600
    Pascal. Now rare, but widely recognized and occasionally used for brevity.
    Used in the example entry under BNF. See also EOF.