Essentially it's his Mars craft that they/he calls Starship.
It's the 1st test of the fuselage deliberately without a nose cone, fins and any other form of aerodynamics that manipulate stability. The idea was to test the ultra light material it's made from, a new alloy, for stresses. As well as testing the Raptor engine and it's software, to see if the could steer it through software and the engine alone. Which has to be said they did splendidly.
That one will be binned and the next one will have the nose cone, fins and three Raptor engines.