# Plus–minus Sign

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±=
HTML Meaning
± &plusmn;
&#177;
U+B1
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.
&#8723;
U+2213
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 &plusmn; or the numeric entity &#177;.
• LaTeX: To type the Plus–minus Sign in LaTeX, use the command \pm.