The term KNOX can be summarized as a FORT, which is a four-letter word. A FORT is a defensive structure, typically made of stone or brick, designed to protect a military base or settlement from attack. Forts were commonly used in the past to protect cities and towns from enemy forces. The most famous example of a FORT is FORT Knox, located in Kentucky, United States. It is a United States Army post and is the site of the United States Bullion Depository, where a large portion of the United States' gold reserves are stored.