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, Syriac, Slovak, Slovene, Serbian Latin, and Croatian š, and English sh, and Portuguese x,ch. The Cyrillic letter ш represents the same sound.
Ŝ is used in for letter Щ.