I believe the nickname for the car was "ghost whisperer".
As to the type designation I'm not certain.
It could be the Rover-BRM T4 Gas Turbine LM63.
The car was based on an old BRM Type 56 (or 57 - whoever one believes) that was raced in 1961 by Richie Ginther.
I expect Doug Nye's volumes on BRM would clear this point up.