Years ago, MacBooks incorporated a slot for using a cable lock to secure the device to a table leg or similar. They were most useful in coffee shops when you wanted to return to the counter to order another drink without having to carry your laptop with you.
Source: [9to5Mac](https://9to5mac.com/2026/08/25/macbook-lock-aims-to-keep-your-laptop-safe-in-coffee-shops/)