U+222A Union
U+222A 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 cup.
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 not mirrored. If its East Asian Width is “narrow”, U+222A 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 glyph can be confused with one other glyph.
The CLDR project calls this character “union” for use in screen reading software. It assigns these additional labels, e.g. for search in emoji pickers: collection, set.
The Wikipedia has the following information about this codepoint:
In set theory, the union (denoted by ∪) of a collection of sets is the set of all elements in the collection. It is one of the fundamental operations through which sets can be combined and related to each other. A nullary union refers to a union of zero () sets and it is by definition equal to the empty set.
For explanation of the symbols used in this article, refer to the table of mathematical symbols.
Representations
| System | Representation |
|---|---|
| Nº | 8746 |
| UTF-8 | E2 88 AA |
| UTF-16 | 22 2A |
| UTF-32 | 00 00 22 2A |
| URL-Quoted | %E2%88%AA |
| HTML hex reference | ∪ |
| Wrong windows-1252 Mojibake | ∪ |
| HTML named entity | ∪ |
| alias | cup |
| Encoding: BIG5 (hex bytes) | A1 E5 |
| Encoding: BIG5HKSCS (hex bytes) | A1 E5 |
| Encoding: CP932 (hex bytes) | 81 BE |
| Encoding: CP949 (hex bytes) | A1 FA |
| Encoding: CP950 (hex bytes) | A1 E5 |
| Encoding: EUC_JP (hex bytes) | A2 C0 |
| Encoding: EUC_JIS_2004 (hex bytes) | A2 C0 |
| Encoding: EUC_JISX0213 (hex bytes) | A2 C0 |
| Encoding: EUC_KR (hex bytes) | A1 FA |
| Encoding: GB2312 (hex bytes) | A1 C8 |
| Encoding: GBK (hex bytes) | A1 C8 |
| Encoding: GB18030 (hex bytes) | A1 C8 |
| Encoding: HZ (hex bytes) | 7E 7B 21 48 7E 7D |
| Encoding: ISO2022_JP (hex bytes) | 1B 24 42 22 40 1B 28 42 |
| Encoding: ISO2022_JP_1 (hex bytes) | 1B 24 42 22 40 1B 28 42 |
| Encoding: ISO2022_JP_2 (hex bytes) | 1B 24 42 22 40 1B 28 42 |
| Encoding: ISO2022_JP_2004 (hex bytes) | 1B 24 42 22 40 1B 28 42 |
| Encoding: ISO2022_JP_3 (hex bytes) | 1B 24 42 22 40 1B 28 42 |
| Encoding: ISO2022_JP_EXT (hex bytes) | 1B 24 42 22 40 1B 28 42 |
| Encoding: ISO2022_KR (hex bytes) | 1B 24 29 43 0E 21 7A 0F |
| Encoding: JOHAB (hex bytes) | D9 9C |
| Encoding: SHIFT_JIS (hex bytes) | 81 BE |
| Encoding: SHIFT_JIS_2004 (hex bytes) | 81 BE |
| Encoding: SHIFT_JISX0213 (hex bytes) | 81 BE |
| LATEX | \cup |
| Adobe Glyph List | union |
| digraph | )U |
Related Characters
Confusables
Elsewhere
Complete Record
| Property | Value |
|---|---|
| 1.1 (1993) | |
| UNION | |
| — | |
| Mathematical Operators | |
| Math Symbol | |
| Common | |
| Other Neutral | |
| Not Reordered | |
| none | |
| Union | |
| ✘ | |
| Union | |
| Union | |
| ✘ | |
| Union | |
| Union | |
| Union | |
| Union | |
| Union | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| Union | |
| Any | |
| ✔ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| 0 | |
| 0 | |
| 0 | |
| ✘ | |
| None | |
| — | |
| NA | |
| Other | |
| — | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✔ | |
| ✘ | |
| Yes | |
| Yes | |
| Union | |
| Yes | |
| Union | |
| Yes | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✔ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| Other | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| Other | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| Union | |
| None | |
| ambiguous | |
| Not Applicable | |
| — | |
| No_Joining_Group | |
| Non Joining | |
| Ambiguous (Alphabetic or Ideographic) | |
| none | |
| not a number | |
| Union | |
| R |