Greek Small Letter Sigma
U+03C3 · decimal 963 · Greek and Coptic
Every way to write it
7 formsσ
A named entity — readable, and safe in any HTML document without declaring a charset.
σ
The numeric form works everywhere a named one does, and exists for every character.
\03C3
For a content property in a ::before or ::after rule. No semicolon, and mind the trailing space.
\u03C3
Valid in a JavaScript or JSON string literal, so it survives files and pipelines that are not UTF-8 clean.
\u03C3
The escape for a Python string literal.
%CF%83
Percent-encoded UTF-8, for a query string or a path segment.
CF 83
2 bytes on the wire. Seeing these as separate garbled characters means something decoded them as single-byte text.
Typing it without copying
system pickerControl + Command + Space, then search greek small letter sigma
Character Map or Alt + 963