Answer Description
A cable lock will physically secure the laptop to a desk, counter, or table. This will keep the laptops from being stolen, but still portable when unlocked.
Wikipedia
A Kensington Security Slot (also called a K-Slot or Kensington lock) is part of an anti-theft system designed in the early 1990s 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
Kensington_Security_Slot - Wikipedia, the free encyclopedia