“The 3rd or Inner Eye – A metaphysical opening which refers to the 6th chakra (serpent power), that leads to higher consciousness. A new age symbol of enlightenment.” Wikipedia
According to those who practice New Age it’s the psychic ability connected to the occult. Through meditation one opens himself up to the spirit realm and it is through this process that one achieves an altered state of consciousness. The emptying of your mind and the opening of a ‘doorway’….which might I suggest is a “demonic doorway”.