About this degree symbol
The degree sign is U+00B0, and it does double duty: 21° for temperature and 45° for an angle are the same character. Two lookalikes cause most of the confusion. The masculine ordinal indicator º (U+00BA) comes from Spanish and Portuguese ordinals and is slightly smaller and often underlined by the font, while the superscript zero ⁰ belongs to mathematical notation. Copying the real degree sign avoids all of it. There are also precomposed ℃ and ℉ characters, which look tidy but are best avoided in body text: most style guides and screen readers prefer the plain degree sign followed by the letter, written as 21 °C. For angles, the prime and double prime characters mark minutes and seconds of arc, which is why coordinates read 40°26′46″ rather than using quote marks.
| Symbol | Unicode name | Code point | HTML | Windows alt code | CSS |
|---|---|---|---|---|---|
| ° | Degree sign | U+00B0 | ° | Alt + 176 | \00B0 |
| ℃ | Degree Celsius | U+2103 | ℃ | Alt + 8451 | \2103 |
| ℉ | Degree Fahrenheit | U+2109 | ℉ | Alt + 8457 | \2109 |
| º | Masculine ordinal indicator | U+00BA | º | Alt + 186 | \00BA |
| ª | Feminine ordinal indicator | U+00AA | ª | Alt + 170 | \00AA |
| ∠ | Angle | U+2220 | ∠ | Alt + 8736 | \2220 |
| ⊾ | Right angle with arc | U+22BE | ⊾ | Alt + 8894 | \22BE |
| ′ | Prime (minutes of arc) | U+2032 | ′ | Alt + 8242 | \2032 |
| ″ | Double prime (seconds of arc) | U+2033 | ″ | Alt + 8243 | \2033 |
| K | Kelvin (plain letter, preferred) | U+004B | K | Alt + 75 | \004B |
| ± | Plus-minus sign | U+00B1 | ± | Alt + 177 | \00B1 |
| × | Multiplication sign | U+00D7 | × | Alt + 215 | \00D7 |
| ÷ | Division sign | U+00F7 | ÷ | Alt + 247 | \00F7 |
| ≈ | Almost equal to | U+2248 | ≈ | Alt + 8776 | \2248 |
| ≠ | Not equal to | U+2260 | ≠ | Alt + 8800 | \2260 |
| ≤ | Less-than or equal to | U+2264 | ≤ | Alt + 8804 | \2264 |
| ≥ | Greater-than or equal to | U+2265 | ≥ | Alt + 8805 | \2265 |
| √ | Square root | U+221A | √ | Alt + 8730 | \221A |
| π | Greek small letter pi | U+03C0 | π | Alt + 960 | \03C0 |
| Σ | Greek capital letter sigma | U+03A3 | Σ | Alt + 931 | \03A3 |
| Δ | Greek capital letter delta | U+0394 | Δ | Alt + 916 | \0394 |
| µ | Micro sign | U+00B5 | µ | Alt + 181 | \00B5 |
| ‰ | Per mille sign | U+2030 | ‰ | Alt + 8240 | \2030 |
| ² | Superscript two | U+00B2 | ² | Alt + 178 | \00B2 |
| ³ | Superscript three | U+00B3 | ³ | Alt + 179 | \00B3 |
| ½ | Vulgar fraction one half | U+00BD | ½ | Alt + 189 | \00BD |