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

kensington security lock slot   Dan kensington security slot™

Compatible with Kensington Standard MicroSaver™T-Bar™ locks; Alcohol surface preparation pad included; Ideal for when the Kensington security slot is

K-Slot is an anti-theft security lock system designed by Kensington Computer Products Group It is a small, metal-reinforced slot found comm K-Slot is an anti-theft security lock system designed by Kensington Computer Products Group It is a small, metal-reinforced slot found comm

mega ace jili slot Locks are generally secured in place with a key or combination lock attached to a rubberized metal cable The end of the cable has a small loop that allows the Kensington cable lock slot for security As you can read in these reviews, it seems that many people w MBPs can't get their cable locks to