- Anything which radiates or emits rays.
- (Automotive) A device that lowers engine coolant temperature by conducting heat to the air, through metal fins.
- (Buildings) A finned metal fixture that carries hot water or steam in order to heat a room.
- (electronics) A type of antenna.
- a Scottish and Northern Irish surname, variant of Rankin
- (physics) a thermodynamic cycle used as an ideal standard for the comparative performance of heat engines