In Yoga the union of Shiva-Shakti is seen as the union of Consciousness and energy. One cannot exist without another. It is a non-duality form and they are mirror images of each other, together they become an indestructible force.

noun. , Hinduism. the Godhead, of which the masculine, passive, transcendent, eternal principle is Shiva, and the feminine, active, immanent, temporal principle is Shakti, the Divine Mother.

Together, Shiva and Shakti represent the union of opposites, or the merging of consciousness and energy. In union, Shiva and Shakti form the composite deity known as Ardhanarishvara, the half-woman lord.

Shatkona (षट्कोण) is a symbol used in Hindu yantra; a “six-pointed star” is made from two interlocking triangles; the upper stands for Shiva, Purusha, the lower for Shakti, Prakriti. Their union gives birth to Sanat Kumara, whose sacred number is six.