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+03C2 forms with similar adjacent characters prevents a line break inside it. The glyph can be confused with 6 other glyphs.
The Wikipedia has the following information about this codepoint:
Sigma ( SIG-mə; uppercase Σ, lowercase σ, lowercase in word-final position ς; Greek: σίγμα) is the eighteenth letter of the Greek alphabet. In the system of Greek numerals, it has a value of 200. In general mathematics, uppercase Σ is used as an operator for summation. When used at the end of a letter-case word (one that does not use all caps), the final form (ς) is used. In Ὀδυσσεύς (Odysseus), for example, the two lowercase sigmas (σ) in the center of the name are distinct from the word-final sigma (ς) at the end. The Latin letter S derives from sigma while the Cyrillic letter Es derives from a lunate form of this letter.
Representations
System
Representation (click value to copy)
Nº
962
UTF-8
CF 82
UTF-16
03 C2
UTF-32
00 00 03 C2
URL-Quoted
%CF%82
HTML hex reference
ς
Wrong windows-1252 Mojibake
Ï‚
HTML named entity
ς
HTML named entity
ς
HTML named entity
ς
alias
stigma (the Modern Greek name for this letterform)
Encoding: CP737 (hex bytes)
AA
Encoding: CP869 (hex bytes)
ED
Encoding: CP875 (hex bytes)
BA
Encoding: CP1253 (hex bytes)
F2
Encoding: EUC_JP (hex bytes)
8F A6 F8
Encoding: EUC_JIS_2004 (hex bytes)
A6 D9
Encoding: EUC_JISX0213 (hex bytes)
A6 D9
Encoding: GB18030 (hex bytes)
81 30 CB 39
Encoding: ISO2022_JP_1 (hex bytes)
1B 24 28 44 26 78 1B 28 42
Encoding: ISO2022_JP_2 (hex bytes)
1B 24 28 44 26 78 1B 28 42
Encoding: ISO2022_JP_2004 (hex bytes)
1B 24 28 51 26 59 1B 28 42
Encoding: ISO2022_JP_3 (hex bytes)
1B 24 28 4F 26 59 1B 28 42
Encoding: ISO2022_JP_EXT (hex bytes)
1B 24 28 44 26 78 1B 28 42
Encoding: ISO8859_7 (hex bytes)
F2
Encoding: MAC_GREEK (hex bytes)
F7
Encoding: SHIFT_JIS_2004 (hex bytes)
83 D7
Encoding: SHIFT_JISX0213 (hex bytes)
83 D7
Encoding: CP875 (hex bytes)
BA
LATEX
\varsigma
Adobe Glyph List
sigma1
Adobe Glyph List
sigmafinal
digraph
*s
RFC 5137
\u'03C2'
Bash and Zsh inside echo -e
\u03C2
C and C++
\u03C2
C#
\u03C2
CSS
\0003C2
Excel
=UNICHAR(962)
Go
\u03C2
JavaScript
\u03C2
Modern JavaScript since ES6
\u{3c2}
JSON
\u03C2
Java
\u03C2
Lua
\u{3C2}
Matlab
char(962)
Perl
"\x{3C2}"
PHP
\u{3c2}
PostgreSQL
U&'\03C2'
PowerShell
`u{3C2}
Python
\u03C2
Ruby
\u{3c2}
Rust
\u{3c2}
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