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

It works by confirming your logins — often only those from a new location or a new device, but some implementations verify every sign-on attempt — with a one-time numeric code sent to a device ...

ISO currency codes are three-letter codes that represent the currencies used throughout the world for financial transactions and forex markets. Each letter code also has a corresponding numeric ...

While it might not be much of a "secret," you can use numeric codes to reveal movie genre lists on Netflix.

Bar code scanning is an easy way to track your business inventory or even keep tabs on office supplies. Many bar codes contain a lot number.