symbol-name
      Specifies  a  1-  to  31-character  user-defined  symbol  to   be
      associated  with the specified value.  The symbol name must start
      with an alphabetic character, and  can  consist  of  alphanumeric
      characters, dollar signs ($), underscores (_), and/or periods (.).
      (PATCH does not distinguish between  uppercase  and  lowercase
      letters; that is, the value ABC is equivalent to the value abc.)
      The symbol name cannot be a pathname.

 value
      Specifies a numeric address or symbolic expression that is to  be
      assigned the specified symbolic name.