𐰾

Two possibilities:

1. Clauson (1962) suggests that it was Derived from Sogdian 𐼈 (z, “zayn”), ultimately from Classical Syriac ܙ (“zayn”).
2. Clauson (1970) suggests that it was Derived from Ancient Greek Σ (S, “sigma”) through intermediaries.

𐰾 (s²)

1. A letter of the Old Turkic runic script, representing /s/, used with front vowels.

• ⇒ Old Hungarian: 𐳥, 𐲥

• Clauson, Gerard (1972) “s²”, in The Origin of Turkic Runic Alphabet, London, pages 70 and 75
• Tekin, Talât (1968) A Grammar of Orkhon Turkic (Uralic and Altaic Series; 69), Bloomington: Indiana University, →ISBN, page 27