This character is a Other Number and is commonly used, that is, in no specific script. The codepoint has the numeric value 4.
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. The word that U+1D2C4 forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
The Kaktovik numerals or Kaktovik Iñupiaq numerals are a base-20 system of numerical digits created by Alaskan Iñupiat. They are visually iconic, with shapes that indicate the number being represented.
The Iñupiaq language has a base-20 numeral system, as do the other Eskimo–Aleut languages of Alaska and Canada (and formerly Greenland). Arabic numerals, which were designed for a base-10 system, are inadequate for Iñupiaq and other Inuit languages. To remedy this problem, students in Kaktovik, Alaska, invented a base-20 numeral notation in 1994, which has spread among the Alaskan Iñupiat and has been considered for use in Canada.
Representations
System
Representation (click value to copy)
Nº
119492
UTF-8
F0 9D 8B 84
UTF-16
D8 34 DE C4
UTF-32
00 01 D2 C4
URL-Quoted
%F0%9D%8B%84
HTML hex reference
𝋄
Wrong windows-1252 Mojibake
ð‹„
Encoding: GB18030 (hex bytes)
94 32 E8 36
RFC 5137
\u'1D2C4'
Bash and Zsh inside echo -e
\U0001D2C4
C and C++
\U0001D2C4
C#
\U0001D2C4
CSS
\01D2C4
Excel
=UNICHAR(119492)
Go
\U0001D2C4
JavaScript
\uD834\uDEC4
Modern JavaScript since ES6
\u{1d2c4}
JSON
\uD834\uDEC4
Java
\uD834\uDEC4
Lua
\u{1D2C4}
Matlab
char(119492)
Perl
"\x{1D2C4}"
PHP
\u{1d2c4}
PostgreSQL
U&'\+01D2C4'
PowerShell
`u{1D2C4}
Python
\U0001D2C4
Ruby
\u{1d2c4}
Rust
\u{1d2c4}
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