The Dragon's Fang is an ancient symbol, though its original meaning has been forgotten by present-day people.
In the Age of Legends, the Dragon's Fang, along with the Flame of Tar Valon, was part of the ancient symbol of the Aes Sedai. Since the Breaking and the splitting of the Aes Sedai to remove the men, the Dragon's Fang has taken on an evil meaning. A common use is to be scrawled on someone's door as an accusation of evil or as a curse. It is no longer connected with male channelers by the common person, and its origins are lost to common knowledge by the passing of years, but superstition still regards the Fang as an omen of evil or ill luck.