The mark consists of A triangle representing the CIA triad of Cyber security Confidentiality, Integrity, and Authentication. Also contains the Shield Knot Four Corners, Quaternary knot This symbol is usually just a looped square, but sometimes it may contain a circle in the center. The shield knot was used as a symbol of protection, to ward off evil spirits and harm. Many soldiers would carry amulets of the charm with them when going to the battlefield. Alternatively, this symbol was placed on the battlefield to protect the soldiers from harm.