What is plus minus symbol?

The plus-minus symbol ± is a mathematical symbol that indicates the range of possible values for a given measurement or calculation. It is used to show that a number can be either positive or negative and is often used when presenting statistical data. The symbol can be written as a superscript or a subscript and is typically used in conjunction with other mathematical symbols to show a range or uncertainty. The symbol was first used in mathematics in the 16th century and has since become a standard notation in mathematics, physics, and engineering.