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+1689 forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
Coll is the Irish name of the ninth letter of the Ogham alphabet ᚉ, meaning "hazel-tree", which is related to Welsh collen pl. cyll, and Latin corulus. Its Proto-Indo-European root was *kos(e)lo-. Its phonetic value is [k].
Representations
System
Representation (click value to copy)
Nº
5769
UTF-8
E1 9A 89
UTF-16
16 89
UTF-32
00 00 16 89
URL-Quoted
%E1%9A%89
HTML hex reference
ᚉ
Wrong windows-1252 Mojibake
ᚉ
Encoding: GB18030 (hex bytes)
81 34 AD 33
RFC 5137
\u'1689'
Bash and Zsh inside echo -e
\u1689
C and C++
\u1689
C#
\u1689
CSS
\001689
Excel
=UNICHAR(5769)
Go
\u1689
JavaScript
\u1689
Modern JavaScript since ES6
\u{1689}
JSON
\u1689
Java
\u1689
Lua
\u{1689}
Matlab
char(5769)
Perl
"\x{1689}"
PHP
\u{1689}
PostgreSQL
U&'\1689'
PowerShell
`u{1689}
Python
\u1689
Ruby
\u{1689}
Rust
\u{1689}
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