What color indicates a warning sign?

The color that indicates a warning sign is yellow. Yellow is universally recognized as a color that conveys caution or attention, signaling that there may be potential hazards or situations that require increased awareness. In the context of lifeguarding and safety signage, yellow is often used to alert individuals about dangerous conditions, such as slippery surfaces, areas where swimming may be restricted, or other potential dangers in and around water. This understanding helps people take necessary precautions to ensure their safety and the safety of others while participating in water activities.