The term 'BIG NAME IN LOCKS' can be summarized as the crossword solution 'YALE', which is a four letter word. YALE is a well-known brand of locks and hardware, founded in 1868 by Linus YALE Jr. The company is known for its high quality security products, such as door locks, padlocks, and other security hardware. YALE is one of the most trusted names in the security industry, and its products are used in homes, businesses, and government buildings around the world.