/sys$common/syshlp/HELPLIB.HLB  —  MACRO  /ALPHA  Symbols
    You use symbols in MACRO-64 source statements to represent an
    instruction, directive, register name, or value. You can use four
    types of symbols in MACRO-64 source programs: permanent symbols,
    predefined symbols, user-defined symbols, and macro names.
Additional Information: explode extract
Permanent Symbols Predefined Symbols User-Defined Symbols and Macro Names Determining Symbol Values Using Symbols in the Operator Field Using Symbols in the Operand Field
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