Not nearly enough information.
Please post a new question with the coin's date and denomination. Also include any wording EXCEPT "Republique Francaise" or "Liberte, Egalite, Fraternite" - that will be on all French coins and doesn't help narrow down what it is.
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it is "sou". It the name of an ancient coin, still used in proverbs ("un sou est un sou" = even a small coin is money - "les sous ne poussent pas sur les arbres" = money does not grow on trees) and in everyday spoken language ("il a des sous" = he is rich)
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it could also be sou. (thats what it is in the crossword i did this morning). i just checked to make sure
Un sou is the French coin with 3 letters. Sou is slang for a small coin of little value.