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A plus sign above a minus stroke, giving a tolerance or two possible values.
Also known as: Plus or minus, Tolerance sign, Margin of error sign
The plus–minus sign states that a quantity may be added or subtracted — a measurement tolerance, a margin of error, or the two roots of a quadratic.
States a tolerance or uncertainty around a value, as in 20 ± 2, meaning anywhere from 18 to 22.
Contexts: Mathematics
Indicates that both the positive and negative case hold, as in the two solutions of a quadratic equation.
Contexts: Mathematics
An upright cross of two equal strokes, with a separate horizontal bar set directly beneath it.
Reciprocates the minus sign's warning: the plus–minus sign contains a minus stroke.
The lower stroke.
The upper element.