More specifically, the name of a free software enabling P2P radio.
P2P Radio 2.0
"P2P-Radio provides a peer-to-peer audio and video broadcasting system.
P2P-Radio is a peer-to-peer audio (MP3) and video (NSV) broadcasting system that features freeloader detection, stream signing, SHOUTcast support, an easy-to-use GUI, and a separate monitor application which displays the current structure of the P2P network.
P2P-Radio is programmed in Java and runs on Windows, Mac OS X, Linux and many other systems."