U+00B1 "±" Plus-Minus Sign Unicode Character

U+00B1 "±" Plus-Minus Sign is a typographic symbol that indicates an allowable tolerance, range, or approximation, commonly used in mathematics, science, and engineering to denote a value that could be either added or subtracted, such as in expressions like "5 ± 3" meaning a range from 2 to 8. It also appears in contexts like error margins, standard deviation, or when presenting two possible values, such as the positive and negative square roots of a number. Its visual design combines a plus sign placed directly above a minus sign, and it is distinct from the similar but separate "minus-or-plus" sign (∓).