Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Terrorism serves to communicate a message from terrorists to a target audeince. Symbols play an important role in this communication, through graphics that the organizations use to represent themselves, as well as the meaning and significance behind their choice of targets, Terrorist Organizations use graphic marks and insignias as symbols to represent their ideology, purpose, and goals. These insignias are replete with meaningful symbols that communicate the message, purpose, history, and goals of the organizations. As such, they contribute to the creation of unique organizational culture. A few databases exist which catalog the symbols used in terrorist images and propaganda, the most prominent of which are the International Terrorist Symbols Database and the Islamic Imagery Project.