This character is a Math Symbol and is commonly used, that is, in no specific script. The character is also known as upper integral.
The glyph is not a composition. It has no designated width in East Asian texts. In bidirectional text it acts as Other Neutral. When changing direction it is mirrored. The word that U+2A1B forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
In real analysis, the Darboux integral is constructed using Darboux sums and is one possible definition of the integral of a function. Darboux integrals are equivalent to Riemann integrals, meaning that a function is Darboux-integrable if and only if it is Riemann-integrable, and the values of the two integrals, if they exist, are equal. The definition of the Darboux integral has the advantage of being easier to apply in computations or proofs than that of the Riemann integral. Consequently, introductory textbooks on calculus and real analysis often develop Riemann integration using the Darboux integral, rather than the true Riemann integral. Moreover, the definition is readily extended to defining Riemann–Stieltjes integration. Darboux integrals are named after their inventor, Gaston Darboux (1842–1917).
Representations
System
Representation (click value to copy)
Nº
10779
UTF-8
E2 A8 9B
UTF-16
2A 1B
UTF-32
00 00 2A 1B
URL-Quoted
%E2%A8%9B
HTML hex reference
⨛
Wrong windows-1252 Mojibake
⨛
alias
upper integral
Encoding: GB18030 (hex bytes)
81 38 8D 33
RFC 5137
\u'2A1B'
Bash and Zsh inside echo -e
\u2A1B
C and C++
\u2A1B
C#
\u2A1B
CSS
\002A1B
Excel
=UNICHAR(10779)
Go
\u2A1B
JavaScript
\u2A1B
Modern JavaScript since ES6
\u{2a1b}
JSON
\u2A1B
Java
\u2A1B
Lua
\u{2A1B}
Matlab
char(10779)
Perl
"\x{2A1B}"
PHP
\u{2a1b}
PostgreSQL
U&'\2A1B'
PowerShell
`u{2A1B}
Python
\u2A1B
Ruby
\u{2a1b}
Rust
\u{2a1b}
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