This character is a Math Symbol and is commonly used, that is, in no specific script.
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 not mirrored. The word that U+29DD forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
The infinity symbol (∞) is a mathematical symbol representing the concept of infinity. This symbol is also called a lemniscate, after the lemniscate curves of a similar shape studied in algebraic geometry, or "lazy eight", in the terminology of livestock branding.
This symbol was first used mathematically by John Wallis in the 17th century, although it has a longer history of other uses. In mathematics, it often refers to infinite processes (potential infinity) rather than infinite values (actual infinity). It has other related technical meanings, such as the use of long-lasting paper in bookbinding, and has been used for its symbolic value of the infinite in modern mysticism and literature. It is a common element of graphic design, for instance in corporate logos as well as in older designs such as the Métis flag.
Both the infinity symbol itself and several variations of the symbol are available in various character encodings.
Representations
System
Representation (click value to copy)
Nº
10717
UTF-8
E2 A7 9D
UTF-16
29 DD
UTF-32
00 00 29 DD
URL-Quoted
%E2%A7%9D
HTML hex reference
⧝
Wrong windows-1252 Mojibake
â§
HTML named entity
⧝
Encoding: GB18030 (hex bytes)
81 38 87 31
RFC 5137
\u'29DD'
Bash and Zsh inside echo -e
\u29DD
C and C++
\u29DD
C#
\u29DD
CSS
\0029DD
Excel
=UNICHAR(10717)
Go
\u29DD
JavaScript
\u29DD
Modern JavaScript since ES6
\u{29dd}
JSON
\u29DD
Java
\u29DD
Lua
\u{29DD}
Matlab
char(10717)
Perl
"\x{29DD}"
PHP
\u{29dd}
PostgreSQL
U&'\29DD'
PowerShell
`u{29DD}
Python
\u29DD
Ruby
\u{29dd}
Rust
\u{29dd}
Click the star button next to each label to set this representation as favorite or remove it from the favorites. Favorites will be shown initially. (Favorites are stored locally on your computer and never sent over the internet.)