VMS Help SCA, SCA Topics, Glossary, SYMBOL_CLASS  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    An attribute selection that identifies the type of symbol. Tells
    you whether the symbol is a variable, constant, or some other
    class. You can use the FIND command to find only symbols with
    a particular symbol class. For example, you can specify "FIND
    symbol=argument." You can abbreviate both "symbol" and "argument".