Koppa

Noun

1. An Ancient Greek letter representing /k/, Ϙ / ϙ, replaced by kappa by the Classical Greek period.
2. The Greek numeral Ϟ (lowercase ϟ), descended from the ancient letter and having the numerical value of 90.
3. The archaic Cyrillic numeral Ҁ (lowercase ҁ), descended from the ancient Greek letter and having the numerical value of 90.