Sha (?, ?) is a letter of the Cyrillic alphabet, representing the consonant sound or . It is roughly equivalent to sh in English, ch in French, sch in German, ? in Hebrew, ? in Turkish, or sz in Polish. In most Latin-alphabet Slavic languages (Czech, Slovak, Slovene, Croatian) this sound is written ?, and linguists have adopted this symbol to transliterate ? into the Latin alphabet. The printed Sha looks something like a W or, more exactly, like an E rotated to the left 90 degrees. It is used in virtually every national variation of the Cyrillic alphabet, for Slavic and non-Slavic languages. In mathematics, the Tate-Shafarevich group is denoted ?, a notation first suggested by J. W. S. Cassels. (Previously it had been unimaginatively denoted TS.)In a different mathematical context, some authors allude to the shape of the letter Sha when they use the term Shah function for what

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