This character is a Other Letter and is mainly used in the Ogham script.
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+1685 forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
Nion (ᚅ) is the Irish name of the fifth letter (Irish "letter": sing.fid, pl.feda) of the Ogham alphabet, with phonetic value [n]. The Old Irish letter name, Nin, may derive from Old Irish homonyms nin/ninach meaning "fork/forked" and "loft/lofty". Nin is notable for being the old name that refers both to this specific letter, and to any of the Ogham letters in general. "Nin" is also an Irish word used for a grandma.
Representations
System
Representation (click value to copy)
Nº
5765
UTF-8
E1 9A 85
UTF-16
16 85
UTF-32
00 00 16 85
URL-Quoted
%E1%9A%85
HTML hex reference
ᚅ
Wrong windows-1252 Mojibake
áš…
Encoding: GB18030 (hex bytes)
81 34 AC 39
RFC 5137
\u'1685'
Bash and Zsh inside echo -e
\u1685
C and C++
\u1685
C#
\u1685
CSS
\001685
Excel
=UNICHAR(5765)
Go
\u1685
JavaScript
\u1685
Modern JavaScript since ES6
\u{1685}
JSON
\u1685
Java
\u1685
Lua
\u{1685}
Matlab
char(5765)
Perl
"\x{1685}"
PHP
\u{1685}
PostgreSQL
U&'\1685'
PowerShell
`u{1685}
Python
\u1685
Ruby
\u{1685}
Rust
\u{1685}
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