I typed that symbol into IB's contract search engine. It appears to be the CBOE Equity Put-Call Ratio. No other information available. As it is a ratio, it is not something that can be traded.
misc.interactivebrokers.com/cstools/contract_info/v3.10/index.php?action=Advanced Search&entityId=a203707427&lang=en&ib_entity=&wlId=IB&showEntities=Y
