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

Object Role Modeling

    (ORM) A conceptual modelling approach that
   pictures the application world as a set of objects that play
   roles (parts in relationships, which may be unary, binary or
   higher order).  ORM provides both graphical and textual
   languages that enable models to be expressed naturally.  For
   data modelling purposes, its graphical language is more
   expressive than ER or UML.

   (http://orm.net/).

   (1999-08-27)