U+03D8 "Ϙ" Greek Letter Archaic Koppa Unicode Character

U+03D8 "Ϙ" Greek Letter Archaic Koppa is a historical Greek letter that was used primarily in early alphabetic writing before the classical period, representing a back vowel or a voiceless velar plosive sound similar to a "k" before being largely replaced by the standard letter Kappa. It originated from the Phoenician letter Qoph and was retained in some local Greek dialects and numeric systems, where it served as the symbol for the number 90 in the ancient acrophonic numeral tradition. Despite its archaic status in standard written Greek, the character is preserved in Unicode for historical and scholarly purposes, including the representation of ancient inscriptions and textual editions.