/sys$common/syshlp/helplib.hlb SHOW, SYMBOL, Parameter  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 symbol-name

    Specifies the name of the symbol whose value you want to display.
    You must specify a symbol name unless you use the /ALL qualifier.
    The asterisk (*)  and the percent sign (%) wildcard characters
    are allowed in the symbol-name parameter.