Νν ⟵ {\displaystyle \longleftarrow } 14 ⟶ {\displaystyle \longrightarrow } Οο Pronunciation IPA (key): /ksaɪ/ or /zaɪ/ or /saɪ/ or /ksiː/ Audio (US)(file) Noun Singular xi Plural xis Xi is the name of the 14th letter in the Greek alphabet. ΞξWikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads