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(nasm.info)Section 3.5.7

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3.5.7. Unary Operators: `+', `-', `~' and `SEG'
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   The highest-priority operators in NASM's expression grammar are
those which only apply to one argument. `-' negates its operand, `+'
does nothing (it's provided for symmetry with `-'), `~' computes the
one's complement of its operand, and `SEG' provides the segment address
of its operand (explained in more detail in *Note Section 3.6::).