In a Surround Sound system with either two Rear Channels, also known as Surround Channels, the Channel intended to go behind the listener and to his right is the Right Surround Channel. In a three Rear Channel configuration this channel is normally positioned directly to the right of the listeners, but is still called Right Surround.
If there are more than three Surround Channels there may be two or more Right Surround Channels, with names like Right Surround Diffuse and Right Surround Direct. For systems with only a single Surround Channel no designation of left or right is necessary.
The Right Surround Channel may be referred as simply Right Surround, as in the Channels are Left, Right, Center, Left Surround, and Right Surround.
The image below shows the position of the Right Surround Channel in a 5.1 Surround Sound configuration.