This character is a Decimal Number and is mainly used in the Ahom script. The codepoint has the decimal value 1.
The glyph is not a composition. It has no designated width in East Asian texts. In bidirectional text it is written from left to right. When changing direction it is not mirrored. This number joins with other adjacent letters and numbers to form a word. U+11731 forms a number with similar characters, which prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
The Ahom script or Tai Ahom Script is an abugida that is used to write the Ahom language, a dormant Tai language undergoing revival spoken by the Ahom people till the late 18th-century, who established the Ahom kingdom and ruled the eastern part of the Brahmaputra valley between the 13th and the 18th centuries. The old Ahom language today survives in the numerous manuscripts written in this script currently in institutional and private possession.
Representations
System
Representation (click value to copy)
NΒΊ
71473
UTF-8
F0 91 9C B1
UTF-16
D8 05 DF 31
UTF-32
00 01 17 31
URL-Quoted
%F0%91%9C%B1
HTML hex reference
𑜱
Wrong windows-1252 Mojibake
Γ°βΕΒ±
Encoding: GB18030 (hex bytes)
90 34 DA 37
RFC 5137
\u'11731'
Bash and Zsh inside echo -e
\U00011731
C and C++
\U00011731
C#
\U00011731
CSS
\011731
Excel
=UNICHAR(71473)
Go
\U00011731
JavaScript
\uD805\uDF31
Modern JavaScript since ES6
\u{11731}
JSON
\uD805\uDF31
Java
\uD805\uDF31
Lua
\u{11731}
Matlab
char(71473)
Perl
"\x{11731}"
PHP
\u{11731}
PostgreSQL
U&'\+011731'
PowerShell
`u{11731}
Python
\U00011731
Ruby
\u{11731}
Rust
\u{11731}
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