U+03F9 GREEK CAPITAL LUNATE SIGMA SYMBOL

The Unicode character U+03F9, officially named GREEK CAPITAL LUNATE SIGMA SYMBOL, was introduced in Unicode version 4.0. It is part of the Greek block, which belongs to the Basic Multilingual plane.

Categorized technically as a Uppercase Letter, this character typically falls under the Greek script. In terms of text layout and rendering, the glyph is a compatibility composition and has no designated width in East Asian typography. When placed in bidirectional text, it behaves as an Left-To-Right character. Its visual representation remains not mirrored regardless of the reading direction.