Ŝ

Ŝ or ŝ is a consonant in Esperanto orthography, representing the sound.
Esperanto orthography uses a diacritic for all four of its postalveolar consonants, as do most Latin-based Slavic alphabets. Letters and digraphs that are similar to ŝ and represent the same sound include Czech, Latvian, Lithuanian, Slovak, Slovene, Serbian Latin, and Croatian š, Albanian and English sh, German sch, Polish sz, Azerbaijani, Turkish and Turkmen ş, Romanian ș, Hungarian s, French ch, and Portuguese x and ch. The Cyrillic letter ш represents the same sound and represents a circumflex type with the up in down fricative consonant.
Ŝ is used in ISO 9:1995 for letter Щ, and is used in the orthography of the Tsilhqotʼin language.