I meant star shaped, not "scuare" shaped. The handles are usually squared, but yes, the heads are designed with a pattern so 1) you can apply more torque 2) mis-inserting the tool doesn't mess with the socket.
Square drive is probably just the power tool 1/4" square drive, used for fasteners. I've seen this done too.
I must go to this Ace. I was pretty happy with the Ace at BurJumann, for the size. The "GMC" ultra-cheap australian/chinese powertools are actually decent.