What is the symbol on the car radiator cap?

[SilasRose]

There are two types of car radiator cap symbols: 1. The radiator cap for the cooling radiator is yellow and bears a high-temperature warning; 2. The expansion tank cap has no symbol. Although the expansion tank cap lacks a symbol, the expansion tank itself is easily identifiable—it is made of white plastic, contains red liquid, and features min and max level marks on the exterior. When the engine reaches its normal operating temperature, the coolant circulates through the cooling radiator to dissipate heat, thereby maintaining the engine within an optimal temperature range. The cooling radiator is located at the front of the vehicle and is also equipped with a cap.