It was derived from the Phoenician letter kaph . Both the "kaph" and "pe" in these nouns are with a "dagesh". The six are Bet, Gimel, Daleth, Kaph, Pe, and Tav. In colloquial Hebrew, Kaph and Shin together have the meaning of "when". The letter represents ; i.e., no distinction is made between Qof and Kaph. In gematria, kaph represents the number 20.