The Free On-line Dictionary of Computing (30 December 2018):

PL360

   Structured assembly language for the IBM 360 and IBM
   370, with a few high-level constructs.  Syntactically it
   resembles ALGOL 60.  Its grammar is defined entirely by
   operator precedence.

   ["PL/360, A Programming Language for the 360 Computers",
   N. Wirth, J ACM 15(1):37-74 (Jan 1968)].

   (1995-01-05)