Answer Description

Cable locks are a physical security measure that can prevent small or mobile devices from being physically removed from a location. These are often called cable locks but may also be called a Kensington lock or Kensington security slot. The goal is to secure the device to another large object like a well, desk or cart.

Wikipedia

A Kensington Security Slot (also called a K-Slot or Kensington lock) is part of an anti-theft system designed in the mid 1980s and patented by Kryptonite in 1999–2000, assigned to Schlage in 2002, and since 2005 owned and marketed by Kensington Computer Products Group, a division of ACCO Brands.