Library /sys$common/syshlp/dbg$help.hlb DEBUG, DELETE, Parameters  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 symbol-name

    Specifies a symbol whose definition is to be deleted from the
    DEFINE symbol table. Do not use the asterisk (*)  wildcard
    character. Instead, use the /ALL qualifier. Do not specify a
    symbol name with /ALL. If you use the /LOCAL qualifier, the
    symbol specified must have been previously defined with the
    DEFINE/LOCAL command. If you do not specify /LOCAL, the symbol
    specified must have been previously defined with the DEFINE
    command without /LOCAL.