Shiva holds the drum known as damaru which represents the creative input of the universe. From the stillness comes the first sound, the rhythm that accompanies Shivas dance. It is the pulsation of the universe -Spanda. Its also said that the drum being shaped like two triangles with their points touching represent shiva and shakti and their relationship which manifests the material world. The drum is the primordial sound that emanates from the stillness.At one side its destruction and at the other side its creation, its our universe full of creations and is expanding enormously.At the center its a time less region full of energy , its the place of holy union of Shiva and shakti .