The term “third eye” varies by community in specific meaning but the general meaning across communities refers to a literal or metaphorical sensory organ that allows one to “see” beyond the normally defined five senses into the realm of the psychic.
For those who engage in Eastern practices, the term third eye refers to the third eye or brow chakra, the Ajna, which is located between the eyebrows. This third eye, which connects humans to spirit and their higher selves, is strengthened through meditation and used in conjunction with the other chakras to bring a healthy balance into practitioners’ lives.
Others use the term “third eye” without reference to the chakra system instead of referencing second sight and referencing the third eye as the physical or metaphorical organ via which second sight and other sorts of psychic awareness are made possible.
The third eye is often associated with the pineal gland which regulates sleep patterns and other biological cycles through the production of melatonin and other hormones.