Once upon a time, they were the rectangular strips of card without which you could not catch a plane. Increasingly, they are ...

Do PLU Codes Document How Produce Is Grown? The numeric codes found on produce stickers may or may not reliably identify how those produce items were grown.

Alt key codes give you access to hundreds of special ASCII characters, from accent marks to tiny icons. We show you how to use the Alt codes and also Word's Symbol library.

A numeric-code lock is a nifty feature for when you'd rather leave your keys in the car.

For a long time, passcodes were four-digit numeric codes by default, but with iOS 9, Apple began using a six-digit passcode as the default option.

These DTCs are numeric codes that are stored in the car's computer when a problem is detected. By analyzing DTCs, a car code reader can help to identify the cause of a car's problem.