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The letter theta is the initial of the Greek word Θεωρια (theoria) from which the corresponding words in western languages derive (English: theory, German: Theorie, French: theorie, Italian: teoria). The original meaning of the word is "observation" or "viewing". Herodotus, the father of history, tells us that Solon, the Athenian poet and legislator, "... has travelled around the world for the shake of theory ...". From the same root derives another wide-spread Greek word: theatron (theater, meaning viewing or show).