the world > relative properties > number > mathematical notation or symbol > [noun] > arithmetic or algebraic symbols > positive or negative quantities (3)
the minus sign; (also, in quot. 1851) a sign attached to a consonant in the Nagari alphabet to indicate that it is not followed by a vowel.
the mathematical symbol ‘+’; the plus sign (cf. also sign, n. 2e).
Mathematics. The property of a quantity of being positive or negative.