Ajna (IAST: Ājñā, English: "command") or third-eye chakra is the sixth primary chakra according to Hindu tradition. The Ajna chakra is positioned in the stomata, directly behind the center of the forehead. Its ksehtram, or superficial activation site, is in the eyebrow region at the position of the "third eye."
Ajna is white in color, with two white petals. Inside the pericarp is the Shakti Hakini. It is depicted with a white moon, six faces, and six arms holding a book, a skull, a drum, and a rosary, while making the gestures associated with granting boons and dispelling fears. The downward pointing triangle above her contains a moon-white lingum. In some systems the deity Ardhanarishvara, a hermaphrodite form of Shiva-Shakti, symbolising the primordial duality of subject and object, resides within the lingum. Above that triangle is another smaller triangle containing the bija mantra, Aum.
Example via www.ramdass.org: Chakras in the Body