In French, the ç (cédille) is used to indicate that the c should be pronounced like the S in States. C is normally pronounced like the English K, when followed by vowels A, O or U, and like S when followed by E or I. The cédille indicates that the pronunciation is S even though the following vowel is A (not sure there are cases where ç is followed by u or o).
P.S.: yes, there are examples in the Wikipedia articles of çu and ço
