U+2213 "∓" Minus-or-Plus Sign Unicode Character

U+2213 "∓" Minus-or-Plus Sign is a mathematical symbol that represents the opposite relationship to the more common plus-minus sign "±", serving as a compact notation for expressing an alternative sign order, typically appearing in pair with "±" in expressions like "a ∓ b = c ± d" where the upper sign of "∓" corresponds to the lower sign of "±". It is frequently used in formulas for trigonometric identities, such as cos(A ± B) = cos A cos B ∓ sin A sin B, and in quadratic equations to denote two distinct but related solutions without writing them out separately, though it remains less common in everyday text than its counterpart.