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+1681 forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
Beith (ᚁ) is the Irish name of the first letter (Irish "letter": sing.fid, pl.feda) of the Ogham alphabet, meaning "birch". In Old Irish, the letter name was Beithe, which is related to Welsh bedw(en), Breton bezv(enn), and Latin betula. Its Proto-Indo-European root was *gʷet- 'resin, gum'. Its phonetic value is [b].
Representations
System
Representation (click value to copy)
Nº
5761
UTF-8
E1 9A 81
UTF-16
16 81
UTF-32
00 00 16 81
URL-Quoted
%E1%9A%81
HTML hex reference
ᚁ
Wrong windows-1252 Mojibake
áš
Encoding: GB18030 (hex bytes)
81 34 AC 35
RFC 5137
\u'1681'
Bash and Zsh inside echo -e
\u1681
C and C++
\u1681
C#
\u1681
CSS
\001681
Excel
=UNICHAR(5761)
Go
\u1681
JavaScript
\u1681
Modern JavaScript since ES6
\u{1681}
JSON
\u1681
Java
\u1681
Lua
\u{1681}
Matlab
char(5761)
Perl
"\x{1681}"
PHP
\u{1681}
PostgreSQL
U&'\1681'
PowerShell
`u{1681}
Python
\u1681
Ruby
\u{1681}
Rust
\u{1681}
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