What is on and off coil temprature in cooling coling coil

On Coil Temperature : Is the temperature of air before the coil (Air Still hot before entering the cooling coil for example)

Off Coil Temperature : Is the temperature of air After the coil (Air is cold and treated after leaving the cooling coil for example)
Off coil tempertature is the supply air temperature usually if there is no reheat after the coil