±

± U+00B1, ± PLUS-MINUS SIGN ← ° Latin-1 Supplement ² →

• +/-

The plus sign (+) placed above the minus sign (−).

±

1. (sciences) The plus-minus sign, indicating the tolerance or statistical margin of error of a quantity.
2. (mathematics) Either value as a result of addition or subtraction.

   ${\displaystyle ax^{2}+bx+c=0\Rightarrow x={\frac {-b\pm {\sqrt {b^{2}-4ac}}}{2a}}}$.

3. More or less
   • 1992, Rudolf M Schuster, The Hepaticae and Anthocerotae of North America: East of the Hundredth Meridian, volume V, Chicago, Ill.: Field Museum of Natural History, →ISBN, page 4:

     (b) sporophyte with foot reduced, the entire sporophyte enveloped by the calyptra, which is ± stipitate at the base.

4. (chess) Advantage for white.

• ∓

• give or take
• plus or minus

plus-minus sign on Wikipedia.Wikipedia