EOSLP is a token deployed on eospool.eo. It represents the ownership of both EIDOS and EOS the account eospool.eo holds. You can create your own EOSLP by sending EIDOS or EOS to eoslp.eo. and you can also choose to destroy your EOSLP and claim the EIDOS and EOS it holds by sending it to eoslp.eo. The pool of EIDOS and EOS in eospool.eo is controlled by an automated market maker in eos.eo where you can send EIDOS or EOS to eos.eo and it instantly gives you back the other token.