Ajna also called guru chakra or third-eye chakra is the subtle center of energy, believed to be located between the eyebrows, located behind it along the subtle (non-physical) spinal column. It is so called because this is the spot where the tantra guru touches the seeker during the initiation ritual (saktipata). He or she commands the awakened kundalini to pass through this center.
It is symbolised by a flower with two petals. It is at this point that the two side nadi Ida (yoga) and Pingala are said to terminate and merge with the central channel Sushumna, signifying the end of duality, the characteristic of being dual (e.g. light and dark, or male and female). It corresponds to the colours violet, indigo or deep blue, though it is traditionally described as white.