Note how the links are arranged on the website:
S 3 X Y
S 3 X Y
I prefered the BFR working name (with a nod to Doom).
[0] http://fortune.com/2014/05/07/tesla-drops-model-e-trademark-...
Tesla might still have had a problem of it being too close to the E-Type (Jaguar) if Ford hadn't challenged them.