Terms

Phi, Chi, Psi

Phi, Chi, Psi
Greek also introduced three new consonant letters, Φ (phi), Χ (chi) and Ψ (psi), appended to the end of the alphabet as they were developed. These consonants made up for the lack of comparable aspirates in Phoenician. In western Greek, Χ was used for /ks/ and Ψ for /kʰ/ — hence the value of the Latin letter X, derived from the western Greek alphabet. The origin of these letters is disputed.
 
 
Ph, Ks, Kh
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