複ふく号ごうふくごうMeanings1nounplus-minus sign; double signmathematics›Mathematical term for the ± sign, used to indicate both positive and negative values or two possible operations.二に次じ方ほう程てい式しきの解かいは複ふく号ごうを使つかって表あらわされることが多おおい。Solutions to quadratic equations are often expressed using the plus-minus sign.
