Symbols:Numerical Analysis

Tolerance
$$\pm$$

Defines a range in which a number may lie. $$x = a \pm b$$ means $$a - b \le x \le a + b$$.

In the context of engineering, it is known as a "tolerance", arising from the idea that any number within $$\pm b$$ of $$a$$ is a within a "tolerable" range of the "desired" value.

Its LaTeX code is \pm.

See Arithmetic and Algebra for an alternative definition of this symbol.