At point of sale (especially for packaging within a huge range of products: to quickly differentiate variants, brands, categories)
Morse code | Internal Revenue Code | The Chicago Code | color commentator | The Da Vinci Code | Chapter 11, Title 11, United States Code | ZIP code | source code | The Color Purple | International Code of Zoological Nomenclature | Color Graphics Adapter | In Living Color | Game Boy Color | DVD region code | Criminal Code of Canada | Uniform Code of Military Justice | code | Baudot code | Universal Product Code | The Color Purple (film) | Thornlie | Armadale | color | United States Code | RGB color model | QR code | International Civil Aviation Organization airport code | Color Me Badd | Color Line | Code |
Some vendors initially used a different color code: Logitech used the color orange for the keyboard connector for a short period, but soon switched to purple.