U+00B1
| OS | Layout | Shortcut |
|---|---|---|
| Windows(you) | Us | AltGr + = |
| Windows | Uk | AltGr + + |
| Windows | German | AltGr + + |
| macOS | Us | Option + Shift + = |
| macOS | Uk | Option + + |
| macOS | German | Option + + |
The plus-minus sign indicates that a value can be either positive or negative, or represents a margin of error.
Used in mathematics for roots of equations (x = ±5), in science for measurement tolerances (25°C ± 2°), and in statistics for confidence intervals.