Nāḍī (Sanskrit नाडी nāḍī = tube, pipe; Tamil/ˈ/naadi) நாடி = nerve, blood vessel, pulse: pronounced with long vowel sounds and a retroflex 'd') is a term for the channels through which, in traditional Indian medicine and spiritual science, the energies of the physical body, the subtle body and the causal body are said to flow. Within this philosophical framework, the nadis are said to connect at special points of intensity called nadichakras.