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

ALGOL 58
IAL
International Algebraic Language

    An early version of ALGOL 60, originally known as
   "IAL".

   Michigan Algorithm Decoder (MAD), developed in 1959, was
   based on IAL.

   ["Preliminary report - International Algebraic Language", CACM
   1(12):8, 1958].

   [Details?  Relationship to ALGOL 60?]

   (1999-12-10)