Dial Home Devices, often shortened to DHDs and known as clavis to the Ancients, are large, pedestal-shaped computers placed on almost every planet in the Stargate Network. DHDs establish a wireless link with the nearby Stargate and act as a control device and power source, allowing any intelligent species to dial it without having to rotate the gate manually or develop their own computer interface. Similar to a telephone dial or touch pad (although much larger), the DHD is used to specify which other Stargate to connect to when opening a gate or wormhole to another location. The external symbols on the DHD represent Star Constellations, surrounding the central activation button.