Relay
A device on a network used to extend the reach of a network. Relays are typically placed high for best line-of-sight to meters, and can be plugged into photocell sockets on light poles. Normally, several meters are associated with each Relay and several Relays are associated with an Access Point (AP).
Meters can also act as a Relay. Referred to as repeaters in utility and other networks. See also reachable.