A double dorje, or vishvavajra, are two dorjes connected to form a cross. A double dorje represents the foundation of the physical world and is also associated with certain Tantric Deities
The vajra also is ritual object associated with Tibetan Buddhism also called by its Tibetan name, dorje. These objects usually are made of bronze, vary in size and have three, five or nine spokes that usually close at each end in lotus shape. The number of spokes and the way they come together, or not, at the ends have numerous symbolic meanings.