The Crookes Radiometer, also known as the light mill or solar engine, is a device that demonstrates the thermal effects of electromagnetic radiation. Due to its unique design and functionality, it has earned several synonyms over time. These include the solar windmill, radiometer, light machine, and heliometer. Another interesting synonym for the Crookes Radiometer is the thermoscope, which is derived from the concept of temperature measurement. Regardless of the name used, the Crookes Radiometer remains a remarkable invention that continues to fascinate scientists and enthusiasts alike. Its use in various applications has also made it an essential tool in the fields of physics and energy.