The term triple burner in TCM refers to a collection of organ systems rather than one specific organ. The name San Jiao means three burners or triple burners. It consists of three segments, the Shan Jiao (upper burner) which includes the lungs and heart, the Zhong Jiao (middle burner) which includes the stomach and spleen and the Xia Jiao (lower burner) which includes the liver, small and large intestines, kidneys and urinary bladder.