U+03D9 "ϙ" Greek Small Letter Archaic Koppa Unicode Character

U+03D9 "ϙ" Greek Small Letter Archaic Koppa is a typographic representation of an ancient Greek letter that originally denoted the sound /k/ before being repurposed in later Greek alphabets as the numeric symbol for 90. This glyph appears in historical inscriptions and manuscripts from the Archaic period, particularly in the Western Greek alphabets like those of the Etruscan and early Latin writing systems, where it functioned as a distinct consonant. In modern digital contexts, it is included in Unicode to support scholarly transcription and the precise rendering of ancient texts, distinguishing it from the visually similar Latin letter Q or the modern Greek letter π.