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+03D7 forms with similar adjacent characters prevents a line break inside it. The glyph can be confused with one other glyph.
The Wikipedia has the following information about this codepoint:
Kai (και "and"; Modern Greek:[ce]; Ancient Greek:[kai]; sometimes abbreviated k) is a word that is a conjunction in Greek, Coptic (ⲕⲁⲓ) and Esperanto (kaj; IPA:[kai̯]).
Kai is the most frequent word in any Greek text and thus used by statisticians to assess authorship of ancient manuscripts based on the number of times it is used.
Representations
System
Representation (click value to copy)
Nº
983
UTF-8
CF 97
UTF-16
03 D7
UTF-32
00 00 03 D7
URL-Quoted
%CF%97
HTML hex reference
ϗ
Wrong windows-1252 Mojibake
Ï—
Encoding: GB18030 (hex bytes)
81 30 CD 33
RFC 5137
\u'03D7'
Bash and Zsh inside echo -e
\u03D7
C and C++
\u03D7
C#
\u03D7
CSS
\0003D7
Excel
=UNICHAR(983)
Go
\u03D7
JavaScript
\u03D7
Modern JavaScript since ES6
\u{3d7}
JSON
\u03D7
Java
\u03D7
Lua
\u{3D7}
Matlab
char(983)
Perl
"\x{3D7}"
PHP
\u{3d7}
PostgreSQL
U&'\03D7'
PowerShell
`u{3D7}
Python
\u03D7
Ruby
\u{3d7}
Rust
\u{3d7}
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