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Ancient Greek did not have a /ʃ/ "sh" phoneme, so the derived Greek letter Sigma (Σ) came to represent the voiceless alveolar sibilant /s/. While the letter shape Σ continues Phoenician šîn, its name sigma is taken from the letter Samekh, while the shape and position of samekh but name of šîn is continued in the xi.[citation needed] Within Greek, the name of sigma was influenced by its association with the Greek word σίζω (earlier *sigj-), "to hiss". The original name of the letter "Sigma" may have been san, but due to the early history of the Greek epichoric alphabets, "san" came to be identified as a separate letter, Ϻ.[2] Herodotus reported that "san" was the name given by the Dorians to the same letter called "Sigma" by the Ionians.[3]