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n.
a label associated with something for the purpose of identification; "semantic tags were attached in order to identify different meanings of the word"
n.
something intended to communicate a particular impression; "made a display of strength"; "a show of impatience"; "a good show of looking interested"
n.
a perceptible indication of something not immediately apparent (as a visible clue that something has happened); "he showed signs of strain"; "they welcomed the signs of spring"
n.
a fundamental linguistic unit linking a signifier to that which is signified; "The bond between the signifier and the signified is arbitrary"--de Saussure