U+222C Double Integral
U+222C 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 glyph is a compatibility composition of the glyphs Integral, Integral. 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+222C 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 “double integral” for use in screen reading software. It assigns these additional labels, e.g. for search in emoji pickers: calculus, double, integral.
The Wikipedia has the following information about this codepoint:
In mathematics (specifically multivariable calculus), a multiple integral is a definite integral of a function of several real variables, for instance, f(x, y) or f(x, y, z).
Integrals of a function of two variables over a region in (the real-number plane) are called double integrals, and integrals of a function of three variables over a region in (real-number 3D space) are called triple integrals. For multiple integrals of a single-variable function, see the Cauchy formula for repeated integration.
Representations
| System | Representation |
|---|---|
| Nº | 8748 |
| UTF-8 | E2 88 AC |
| UTF-16 | 22 2C |
| UTF-32 | 00 00 22 2C |
| URL-Quoted | %E2%88%AC |
| HTML hex reference | ∬ |
| Wrong windows-1252 Mojibake | ∬ |
| HTML named entity | ∬ |
| Encoding: CP932 (hex bytes) | 81 E8 |
| Encoding: CP949 (hex bytes) | A1 F3 |
| Encoding: EUC_JP (hex bytes) | A2 EA |
| Encoding: EUC_JIS_2004 (hex bytes) | A2 EA |
| Encoding: EUC_JISX0213 (hex bytes) | A2 EA |
| Encoding: EUC_KR (hex bytes) | A1 F3 |
| Encoding: GB18030 (hex bytes) | 81 36 D4 34 |
| Encoding: ISO2022_JP (hex bytes) | 1B 24 42 22 6A 1B 28 42 |
| Encoding: ISO2022_JP_1 (hex bytes) | 1B 24 42 22 6A 1B 28 42 |
| Encoding: ISO2022_JP_2 (hex bytes) | 1B 24 42 22 6A 1B 28 42 |
| Encoding: ISO2022_JP_2004 (hex bytes) | 1B 24 42 22 6A 1B 28 42 |
| Encoding: ISO2022_JP_3 (hex bytes) | 1B 24 42 22 6A 1B 28 42 |
| Encoding: ISO2022_JP_EXT (hex bytes) | 1B 24 42 22 6A 1B 28 42 |
| Encoding: ISO2022_KR (hex bytes) | 1B 24 29 43 0E 21 73 0F |
| Encoding: JOHAB (hex bytes) | D9 95 |
| Encoding: SHIFT_JIS (hex bytes) | 81 E8 |
| Encoding: SHIFT_JIS_2004 (hex bytes) | 81 E8 |
| Encoding: SHIFT_JISX0213 (hex bytes) | 81 E8 |
| LATEX | \int\!\int |
| Adobe Glyph List | dblintegral |
| digraph | DI |
Related Characters
Confusables
Elsewhere
Complete Record
| Property | Value |
|---|---|
| 1.1 (1993) | |
| DOUBLE INTEGRAL | |
| — | |
| Mathematical Operators | |
| Math Symbol | |
| Common | |
| Other Neutral | |
| Not Reordered | |
| compatibility | |
| Integral Integral | |
| ✘ | |
| Double Integral | |
| Double Integral | |
| ✘ | |
| Double Integral | |
| Double Integral | |
| Double Integral | |
| Double Integral | |
| Double Integral | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✔ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✔ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| Double Integral | |
| Any | |
| ✔ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| 0 | |
| 0 | |
| 0 | |
| ✘ | |
| None | |
| — | |
| NA | |
| Other | |
| — | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✔ | |
| ✘ | |
| Yes | |
| Yes | |
| Integral Integral | |
| No | |
| Integral Integral | |
| No | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✔ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| Other | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| Other | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✔ | |
| ✔ | |
| Double Integral | |
| None | |
| ambiguous | |
| Not Applicable | |
| — | |
| No_Joining_Group | |
| Non Joining | |
| Ambiguous (Alphabetic or Ideographic) | |
| none | |
| not a number | |
| Double Integral | |
| R |