This character is a Other Letter and is mainly used in the Ethiopic 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+1231 forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
Śat (ሰ) is a letter of the Ge'ez abugida, descended from South Arabian 𐩪. It represents both a historical "s" /s/ (a voiceless alveolar fricative), like the s in sink and "ṯ" /θ/ (a voiceless dental fricative), like the th in think.
Representations
System
Representation (click value to copy)
Nº
4657
UTF-8
E1 88 B1
UTF-16
12 31
UTF-32
00 00 12 31
URL-Quoted
%E1%88%B1
HTML hex reference
ሱ
Wrong windows-1252 Mojibake
ሱ
Encoding: GB18030 (hex bytes)
81 33 BC 31
RFC 5137
\u'1231'
Bash and Zsh inside echo -e
\u1231
C and C++
\u1231
C#
\u1231
CSS
\001231
Excel
=UNICHAR(4657)
Go
\u1231
JavaScript
\u1231
Modern JavaScript since ES6
\u{1231}
JSON
\u1231
Java
\u1231
Lua
\u{1231}
Matlab
char(4657)
Perl
"\x{1231}"
PHP
\u{1231}
PostgreSQL
U&'\1231'
PowerShell
`u{1231}
Python
\u1231
Ruby
\u{1231}
Rust
\u{1231}
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