Terms to Google

This page lists things where the main barrier is just knowing what name to Google, after which you should be able to find most of the info you need.

• The product code on fruit — PLU.
• Most other product codes — UPC and GTIN.
• The code on the outside of vehicles, indicating hazardous substances — UN number. [2]

Locks and tamper-resistant devices

• Water faucets that look like the handle is missing — Silcock key
• The hole in an elevator door — Drop key. [2] ^‡
• The black box, a little smaller than a Rubik's Cube, at the main entrance to most commercial buildings — Knox Box.^†
• Heavy equipment — Most earth-movers, backhoes, fork lifts, etc, use a universal key that differs by manufacturer. Sets of these keys are readily available.
• Utility meter lock [1] [2] ^‡

† These are difficult to exploit in practice.

‡ Even if these are easy to exploit, from a technical standpoint, tampering with them carries heavy consequences (legal, personal, or otherwise).