3-d

[Terrytx]

assumimg one of the Ds is depth. what are the other 2?

[Gumbeaux]

Length & width

[Clover]

It stands for 3 dimensions. It doesn't mean there are 3 words all starting with D, it that's what you were looking for.

[Robyn1007]

Or in the motion capture world it's the X, Y, and Z axis.:p

[Terrytx]

thanks guys:D