Plus–minus sign

The plus-minus sign, denoted as ±, is a mathematical symbol used to indicate a value that can be either positive or negative. It is often used in various contexts, such as: 1. **Measurements and Uncertainty**: When reporting a measurement, ± is used to express the potential error or uncertainty in that measurement. For example, if a length is measured as 50 cm ± 2 cm, it means the actual length could be between 48 cm and 52 cm.