UNKNOWN          Remove type information                             Operator

  UNKNOWN expression

    Removes type information from address expression. Use UNKNOWN to force
    yourself to explicitly mention a size whenever you want to reference a
    location. This is useful if you want to treat the location as a type
    of union, allowing the storage of many different data types. By
    defining a symbol as UNKNOWN you can use it exactly as you would an
    anonymous register expression such as [BX].

    Example:    LABEL   digits UNKNOWN
                        db      0,1,0,1

                mov     al,[byte PTR digits]
                mov     ax,[word PTR digits]