U+221A Square Root
U+221A was added in Unicode version 1.1 in 1993. It belongs to the block Mathematical Operators in the Basic Multilingual Plane.
This character is a Math Symbol and is commonly used, that is, in no specific script. The character is also known as radical sign.
The glyph is not a composition. Its width in East Asian texts is determined by its context. It can be displayed wide or narrow. In bidirectional text it acts as Other Neutral. When changing direction it is mirrored. If its East Asian Width is “narrow”, U+221A forms a word with similar characters, which prevents a line break inside it. Otherwise it allows line breaks around it, except in some numeric contexts.
The CLDR project calls this character “square root” for use in screen reading software. It assigns these additional labels, e.g. for search in emoji pickers: radical, radix, root, square, surd.
The Wikipedia has the following information about this codepoint:
In mathematics, the radical symbol, radical sign, root symbol, radix, or surd is a symbol for the square root or higher-order root of a number. The square root of a number x is written as
while the nth root of x is written as
It is also used for other meanings in more advanced mathematics, such as the radical of an ideal.
In linguistics, the symbol is used to denote a root word.
Representations
| System | Representation |
|---|---|
| Nº | 8730 |
| UTF-8 | E2 88 9A |
| UTF-16 | 22 1A |
| UTF-32 | 00 00 22 1A |
| URL-Quoted | %E2%88%9A |
| HTML hex reference | √ |
| Wrong windows-1252 Mojibake | √ |
| HTML named entity | √ |
| HTML named entity | √ |
| alias | radical sign |
| Encoding: BIG5 (hex bytes) | A1 D4 |
| Encoding: BIG5HKSCS (hex bytes) | A1 D4 |
| Encoding: CP437 (hex bytes) | FB |
| Encoding: CP720 (hex bytes) | FB |
| Encoding: CP737 (hex bytes) | FB |
| Encoding: CP860 (hex bytes) | FB |
| Encoding: CP861 (hex bytes) | FB |
| Encoding: CP862 (hex bytes) | FB |
| Encoding: CP863 (hex bytes) | FB |
| Encoding: CP864 (hex bytes) | 83 |
| Encoding: CP865 (hex bytes) | FB |
| Encoding: CP866 (hex bytes) | FB |
| Encoding: CP932 (hex bytes) | 81 E3 |
| Encoding: CP949 (hex bytes) | A1 EE |
| Encoding: CP950 (hex bytes) | A1 D4 |
| Encoding: CP1125 (hex bytes) | FB |
| Encoding: EUC_JP (hex bytes) | A2 E5 |
| Encoding: EUC_JIS_2004 (hex bytes) | A2 E5 |
| Encoding: EUC_JISX0213 (hex bytes) | A2 E5 |
| Encoding: EUC_KR (hex bytes) | A1 EE |
| Encoding: GB2312 (hex bytes) | A1 CC |
| Encoding: GBK (hex bytes) | A1 CC |
| Encoding: GB18030 (hex bytes) | A1 CC |
| Encoding: HZ (hex bytes) | 7E 7B 21 4C 7E 7D |
| Encoding: ISO2022_JP (hex bytes) | 1B 24 42 22 65 1B 28 42 |
| Encoding: ISO2022_JP_1 (hex bytes) | 1B 24 42 22 65 1B 28 42 |
| Encoding: ISO2022_JP_2 (hex bytes) | 1B 24 42 22 65 1B 28 42 |
| Encoding: ISO2022_JP_2004 (hex bytes) | 1B 24 42 22 65 1B 28 42 |
| Encoding: ISO2022_JP_3 (hex bytes) | 1B 24 42 22 65 1B 28 42 |
| Encoding: ISO2022_JP_EXT (hex bytes) | 1B 24 42 22 65 1B 28 42 |
| Encoding: ISO2022_KR (hex bytes) | 1B 24 29 43 0E 21 6E 0F |
| Encoding: JOHAB (hex bytes) | D9 7E |
| Encoding: KOI8_R (hex bytes) | 96 |
| Encoding: KOI8_U (hex bytes) | 96 |
| Encoding: MAC_CYRILLIC (hex bytes) | C3 |
| Encoding: MAC_ICELAND (hex bytes) | C3 |
| Encoding: MAC_LATIN2 (hex bytes) | C3 |
| Encoding: MAC_ROMAN (hex bytes) | C3 |
| Encoding: MAC_TURKISH (hex bytes) | C3 |
| Encoding: SHIFT_JIS (hex bytes) | 81 E3 |
| Encoding: SHIFT_JIS_2004 (hex bytes) | 81 E3 |
| Encoding: SHIFT_JISX0213 (hex bytes) | 81 E3 |
| LATEX | \surd |
| AGL: Latin-2 | radical |
| AGL: Latin-3 | radical |
| AGL: Latin-4 | radical |
| AGL: Latin-5 | radical |
| Adobe Glyph List | radical |
| digraph | RT |
Elsewhere
Complete Record
| Property | Value |
|---|---|
| 1.1 (1993) | |
| SQUARE ROOT | |
| — | |
| Mathematical Operators | |
| Math Symbol | |
| Common | |
| Other Neutral | |
| Not Reordered | |
| none | |
| Square Root | |
| ✘ | |
| Square Root | |
| Square Root | |
| ✘ | |
| Square Root | |
| Square Root | |
| Square Root | |
| Square Root | |
| Square Root | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✔ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| Square Root | |
| Any | |
| ✔ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| 0 | |
| 0 | |
| 0 | |
| ✘ | |
| None | |
| — | |
| NA | |
| Other | |
| — | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✔ | |
| ✘ | |
| Yes | |
| Yes | |
| Square Root | |
| Yes | |
| Square Root | |
| Yes | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✔ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| Other | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| Other | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| Square Root | |
| None | |
| ambiguous | |
| Not Applicable | |
| — | |
| No_Joining_Group | |
| Non Joining | |
| Ambiguous (Alphabetic or Ideographic) | |
| none | |
| not a number | |
| Square Root | |
| R |