Theta

Theta (UK: , US: THAY-tə) uppercase Θ; lowercase θ; Ancient Greek: θῆτα thē̂ta Greek pronunciation: [tʰɛ̂ːta]; Modern: θήτα thī́ta Greek pronunciation: [θita]) is the eighth letter of the Greek alphabet, derived from the Phoenician letter Teth 𐤈. In the system of Greek numerals, it has a value of 9.