A color code is a system for displaying information by using different colors. Color codes are often difficult or impossible for color blind people to understand.

Examples of color codes:

• bottled gases
• electrical wiring
• electronic color code
• 25-pair color code
• fire extinguishers
• hanky code
• jumper cables
• navigation lights, sea marks and characteristic lights
• Ribbon colors see: Category:Ribbon symbolism
• traffic signals
• U.S. Department of Homeland Security's Advisory System
• utility color codes

Note: Different countries have different gas color codes. See the Virtual Anesthesia Machine