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

ALGOL 60
ALGOL

    ALGOrithmic Language 1960.

   A portable language for scientific computations.  ALGOL 60 was
   small and elegant.  It was block-structured, nested,
   recursive and free form.  It was also the first language
   to be described in BNF.

   There were three lexical representations: hardware,
   reference, and publication.  The only structured data types
   were arrays, but they were permitted to have lower bounds
   and could be dynamic.  It also had conditional expressions;
   it introduced :=; if-then-else; very general "for" loops;
   switch declaration (an array of statement labels
   generalising Fortran's computed goto).  Parameters were
   call-by-name and call-by-value.  It had static local
   "own" variables.  It lacked user-defined types, character
   manipulation and standard I/O.

   See also EULER, ALGOL 58, ALGOL 68, Foogol.

   ["Report on the Algorithmic Language ALGOL 60", Peter Naur
   ed., CACM 3(5):299-314, May 1960].

   (1995-01-25)