What's this hole with a lock symbol on the back of my monitor?

Security Locks for Laptops & PCs security lock slot The Kensington slot is the 3 x 7 mm opening on the housing On many devices this opening is marked with a lock symbol Because of the small design of the lock, security cable slot Kensington security slot part of an anti-theft system Language; Watch Wikimedia Commons has media related to Kensington lock ↑ Westover, Brian

security slot ~~ Strong and secure lock and cable ~~ Fits into built-in Kensington security slot found in computers ~~ Patented T-bar theft protection In