What is the full form of bts?

Answer

'BT'

British Telecom (Corporation)
Bit Torrent (form of Peer-to-Peer file Sharing)
Brian Wayne Transeau (Musician)
Bacillus Thuringiensis (natural insecticide)

Perhaps if you were a bit clearer on what it is you're asking about,
the answer could be more clearly defined. Thank you.