When you rotate an object, it doesn't remember it's previous orientation.
For example, if you draw a square, then go into the selector tool and key 45 into the rotate box and hit enter, the square rotates, but the angle returns to 0.
What he's asking for is that an object remember it's angle. So when you first draw it, it's angle is at 0, and when you rotate, it's angle changes but the toolbar always knows what angle it's currently at. Thus you could go back to the toolbar later and enter 0 in the rotation box and get the shape back to the way that it appeared when you first drew it.
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