What has three things?

Answer 1

triplets, singers in a trio, wheels on a tricycle, angles on a triangle, blind mice, little pigs, unicorns on viral YouTube videos,

Answer 2

A stool or tripod typically has three legs to provide stability and support. A traffic light typically has three colored lights (red, yellow, green) to regulate traffic flow. A basic circuit consists of three fundamental components - a voltage source, a resistor, and a current path.