There are quite a few exit codes used on Linux systems, though no listing you can display when you’re feeling curious. In fact, you won’t see the numeric codes unless you specifically ask for ...

A numeric-code lock is a nifty feature for when you'd rather leave your keys in the car. By Lewin Day. Published Jun 12, 2023 9:00 AM EDT. Get The Drive’s daily newsletter.

There is also another type of postal code, the ZIP + 4 code. According to unitedstateszipcodes.org, the ZIP + 4 was established in 1983 and identifies an even more specific location within a ZIP code.