$rBFR are the write tokens that are minted for Liquidity providers against the provided Liquidity. There is a separate $rBFR token for every liquidity pool.
$rBFR tokens give LPs right over the fee generated by writing options and the net pay-off all the options sold against the pool, they can burn the write tokens and take back the provided liquidity + earned yield post a lock-in of 14 days.
Write tokens can be staked to farm $iBFR tokens
If you want to be a designated LP feel free to contact @feyman101 on Telegram