“The knot of Rudra,” is the third energetic and psychic contraction preventing the free flow of prana (energy) in the human being. It is located in ajna chakra (although, according to some yoga practitioners it is at the level of vishuddha chakra or on sushumna nadi between the eyebrows or between vishuddha and ajna chakras). Attachment to siddhis (paranormal powers) is the great hindrance related to ajna chakra and it creates this knot.