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

GPL

   1. General Purpose Language.

   2. ["A Sample Management Application Program in a Graphical
   Data-driven Programming language", A.L. Davis et al, Digest of
   Papers, Compcon Spring 81, Feb 1981, pp. 162-167].

   3. Genken Programming Language.

   4. General Public License.

   [Jargon File]


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

GPL
 /G·P·L/, n.

    Abbreviation for ‘General Public License’ in widespread use; see copyleft
    , General Public Virus. Often mis-expanded as ‘GNU Public License’.