The term 'Symbol of Aggression' is often associated with the word 'FIST', which is a four-letter word. A FIST is a clenched hand, usually used to express anger or frustration. It is also a symbol of strength and power, and is often used in protest movements. In some cultures, it is seen as a sign of solidarity and unity. In sports, it is often used to celebrate a victory. In general, a FIST is a powerful symbol of aggression and defiance.