The sign is a gesture produced with the intention of communicating, that is, in order to transmit one's representation or inner state to another bein… - Umberto Eco

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The sign is a gesture produced with the intention of communicating, that is, in order to transmit one's representation or inner state to another being. The existence of a certain rule (a code) enabling both the sender and the addressee to understand the manifestation in the same way must, of course, be presupposed if the transmission is to be successful; in this sense, navy flags, street signs, signboards, trademarks, labels, emblems, coats of arms, and letters are taken to be signs.