koppa
- An archaic letter of the Greek alphabet, used before the classical period and later replaced by the letter 'kappa'. It was used to represent a sound similar to 'k'. nounIn ancient Greek inscriptions, the letter koppa can occasionally be found.The letter koppa was eventually replaced by kappa in the Greek alphabet.
- A numeral in the Greek numeral system, where it represents the number 90. nounIn Greek numerals, koppa is used to denote the number 90.The symbol for koppa is sometimes seen in ancient Greek texts to indicate numerical values.