This indicates an attempt to use a BitTorrent client that uses the BitTorrent P2P protocol.
BitTorrent is a peer-to-peer (P2P) file-sharing protocol. It is one of the most widely used protocol for file transfer. P2P protocol has been popular with users because of the huge increments in download and upload speed. BitTorrent works by providing a tracker file which list the files that can be transferred and then allows the client to find peers who can transfer the files.