minus sign [计] 减号
minus sign[ noun ]
a sign indicating the operation of subtraction
<noun.communication>
Minus \Mi"nus\ (m[imac]"n[u^]s), a. [L. See {Minor}, and cf.
{Mis-} pref. from the French.] (Math.)
Less; requiring to be subtracted; negative; as, a minus
quantity.
{Minus sign} (Math.), the sign [-] denoting minus, or less,
prefixed to negative quantities, or quantities to be
subtracted. See {Negative sign}, under {Negative}.