Relay (disambiguation)

A relay is an electronic component; a form of switch.

Relay may also refer to:

In communication

• Generally, a connection between the stations of a message-forwarding or transportation system

Historical

• A station for the changing of horses by stagecoach couriers
• Cursus publicus, a courier-service in the Roman Empire
• Relay league, a chain of message-forwarding stations

Modern

Internet

• Bitnet Relay, an online chat-system on the BITNET
• Mail relay, a server used for forwarding e-mail, usually by SMTP
  • Open mail relay, such a server that can be used by anyone
• Relay bot, a specific type of Internet Relay Chat bot which is used to relay messages between separate IRC networks

Other communication channels

• Relay (satellite), a communications satellite
• Broadcast relay station, a broadcast transmitter which repeats or transponds the signal of another
• Microwave radio relay, technology for message-forwarding
• Relay channel, a model of communication between a sender and a receiver aided by one or more intermediate relay nodes
• Telecommunications Relay Service, a telephone accessibility service for the deaf
• Repeater, a device that re-transmits signals from one station to another

Automobiles

• Citroën Relay, a marketing version of the Citroën Jumper van
• Saturn Relay, a minivan produced from 2005-07 by Saturn Corporation

Other uses

• Relay (shop), a France-based chain of convenience stores
• Relay (song), a 1972 song by The Who
• Relay bid, a kind of artificial bid in contract bridge
• Relay race, a race completed in parts by several participants of a team sequentially

See also

• Retransmission (disambiguation)