Kerolox is a type of binary rocket fuel composed of kerosene and liquid oxygen (LOX).

Highly refined form of kerosene used as rocket fuel is called RP-1 (Rocket Propellant-1). It was first used in 1950s and now powers first-stage boosters of Falcon, Soyuz, Delta, Atlas rockets (as well as Energia and even Saturn V in the past).

And, you guessed it, "R.P." are also my initials.