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+1684 forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
Sail or Saille (ᚄ) is the Irish name of the fourth letter (Irish "letter": sing.fid, pl.feda) of the Ogham alphabet, meaning "willow". The name is related to Welsh helyg(en) and Latin salix. Its Proto-Indo-European root was *sal- meaning "dirty,grey". Its phonetic value is [s].
Representations
System
Representation (click value to copy)
Nº
5764
UTF-8
E1 9A 84
UTF-16
16 84
UTF-32
00 00 16 84
URL-Quoted
%E1%9A%84
HTML hex reference
ᚄ
Wrong windows-1252 Mojibake
áš„
Encoding: GB18030 (hex bytes)
81 34 AC 38
RFC 5137
\u'1684'
Bash and Zsh inside echo -e
\u1684
C and C++
\u1684
C#
\u1684
CSS
\001684
Excel
=UNICHAR(5764)
Go
\u1684
JavaScript
\u1684
Modern JavaScript since ES6
\u{1684}
JSON
\u1684
Java
\u1684
Lua
\u{1684}
Matlab
char(5764)
Perl
"\x{1684}"
PHP
\u{1684}
PostgreSQL
U&'\1684'
PowerShell
`u{1684}
Python
\u1684
Ruby
\u{1684}
Rust
\u{1684}
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