Ú/ú is the 34th letter of the Czech alphabet and represents a /uː/ sound. It is always the first letter of the word except in compound words, such as "trojúhelník" triangle, which is composed of two words: "troj", which is derived from "tři" three, and "úhel", which means angle. If this sound is in the middle of the word, letter Ů is used instead. More @Wikipedia
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