A pilot light is a small flame that is constantly burning in gas-powered appliances, such as furnaces, water heaters, and ovens. While the term pilot light is commonly used, there are other synonyms that can be used interchangeably. Some of these synonyms include standing pilot, safety pilot, flame sensor, ignition light, and continuous burner. These terms refer to the same small flame that ignites the main burner in gas appliances. The pilot light is an essential component in these appliances, ensuring that gas is continuously flowing and allowing for easy ignition when the flame is needed.