Plus–minus Sign

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± ±
Plus–minus Sign
The Plus–minus Sign, denoted as ±, is used in mathematics, science, and engineering to indicate an approximation or a range of possible values.
Minus–plus Sign
The Minus–plus Sign, denoted as ∓, is used to indicate that the term it precedes is subtracted from the preceding term.

What is the Plus–minus Sign?

The Plus–minus Sign, symbolized by ±, is used to represent an approximation or a range of possible values.

Example of Using Plus–minus

In algebra, you might see the square root of 9 represented as 9 = ± 3, indicating that it can be either +3 or -3.

Comparing Plus–minus and Minus–plus

The Plus–minus Sign is more commonly used than the Minus–plus Sign. While both symbols indicate uncertainty or variation, the order of operations differs: ± suggests that the term could be either added or subtracted, whereas ∓ implies that the term should be subtracted or added.

Applications and Unique Uses of the Plus–minus Sign

The Plus–minus Sign (±) has various applications and unique uses:

  • Mathematics: Commonly used to indicate the positive and negative square roots of a number.
  • Science: Used in scientific notation to represent uncertainty.
  • Engineering: Employed in technical drawings to indicate tolerances.
  • Statistics: Appears in reports to show the margin of error.
  • Chess: Used in chess notations to evaluate positions.

How to Type the Plus–minus Sign Using Keyboard Shortcuts, Alt Codes, and LaTeX

  • Windows: Hold down the Alt key and type 0177 on the numeric keypad, then release the Alt key.
  • Mac: Press Option + Shift + =.
  • Linux: Press Ctrl + Shift + u, then type 00B1 and press Enter.
  • HTML: Use the named entity ± or the numeric entity ±.
  • LaTeX: To type the Plus–minus Sign in LaTeX, use the command \pm.

Symbols' Images

Plus–minus SignMinus–plus Sign