The term for the loss of heat from an object is "thermal radiation" or simply "heat loss." This process occurs when heat energy is transferred from a hotter object to a cooler surrounding environment. In a more general sense, heat loss can occur through conduction, convection, and radiation. Thermal radiation is the emission of infrared radiation as a form of heat transfer and is significant in understanding energy efficiency and insulation in buildings and appliances. Managing heat loss is crucial in various applications, including engineering, home design, and thermodynamics, to improve energy conservation and effectiveness.