There are different dress codes for different occasions.

The control codes are used to manipulate the behavior of the program.

Gray codes are used in digital communications.

The telegraph codes were used to transmit messages quickly and efficiently.

The store uses UPC codes to track inventory.

The language codes used in this program are EN, FR, and DE.

I forgot my access codes and couldn't log in to my account.

The currency codes for the countries in Europe are EUR, GBP, and CHF.

The country codes for the European Union countries are EU, DE, FR, IT, and ES.

I need to enter the postal codes for all the addresses.