Amazon Best Sellers: Best Laptop Security Locks
Kensington Slim Combination Laptop Lock for Ultra-thin Laptops, Security Computer Lock Cable, T-Bar Standard Slot for HP Lenovo Asus Acer, Resettable 4-wheel Number Code with 6 Foot Cable, K60600WW.
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It's called a Kensington lock, or Kensington security slot, and it provides an attachment point for a cable to prevent your monitor from being moved or stolen.
Laptop Locks & Security Slots: Physical Security | Kensington
6' (2m) 3-in-1 Universal Laptop Cable Lock - Keyed Security Lock for K-Slot, Nano & Wedge Slot Desktop/Laptop-Anti-Theft.