VMS Help FORTRAN, Statements, INTRINSIC  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Specifies that a symbolic name is the name of an intrinsic
  subprogram.  Statement format:

     INTRINSIC v[,v]...

     v  Is the symbolic name of an intrinsic subprogram.

  Subprogram names passed as actual arguments must be identified in
  INTRINSIC statements.  Names of subprograms used as the objects of
  CALL statements or function references do not need to be identified
  with INTRINSIC statements; these names are recognized as intrinsic
  implicitly.