Do the Letters 2D mean anything?

[jimxo]

A friend of mine in MI saw the new C6 motor and the letters 2D were clearly visible to him on the top. I asked him to email me back with what that meant.

Any ideas?

 

[ROCKETBLOCK]

It could be something as simple as 2nd stage Developement engine???

 

[LongTimer]

Rocket's probably right, ... unless ... a rag was sitting on top of an "F" at the end > "2DF". In that case it means Too D*mn Fast