This character is a Connector Punctuation 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+2054 forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
The tie is a symbol in the shape of an arc similar to a large breve, used in Greek, phonetic alphabets, and Z notation. It can be used between two characters with spacing as punctuation, non-spacing as a diacritic, or (underneath) as a proofreading mark. It can be above or below, and reversed. Its forms are called tie, double breve, enotikon or papyrological hyphen, ligature tie, and undertie.
Representations
System
Representation (click value to copy)
Nº
8276
UTF-8
E2 81 94
UTF-16
20 54
UTF-32
00 00 20 54
URL-Quoted
%E2%81%94
HTML hex reference
⁔
Wrong windows-1252 Mojibake
â”
Encoding: GB18030 (hex bytes)
81 36 AA 34
RFC 5137
\u'2054'
Bash and Zsh inside echo -e
\u2054
C and C++
\u2054
C#
\u2054
CSS
\002054
Excel
=UNICHAR(8276)
Go
\u2054
JavaScript
\u2054
Modern JavaScript since ES6
\u{2054}
JSON
\u2054
Java
\u2054
Lua
\u{2054}
Matlab
char(8276)
Perl
"\x{2054}"
PHP
\u{2054}
PostgreSQL
U&'\2054'
PowerShell
`u{2054}
Python
\u2054
Ruby
\u{2054}
Rust
\u{2054}
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