V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

IAM
       Initial Address Message


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

IAM
       Identity and Access Management


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

IAM

   Interactive Algebraic Manipulation.  Interactive symbolic
   mathematics for PDP-10.

   ["IAM, A System for Interactive Algebraic Manipulation", C.
   Christensen et al, Proc Second Symp Symb Alg Manip, ACM Mar
   1971].