About halfway across InDesign’s Control panel is a big P surrounded by brackets. When a you select an object that has been rotated, flipped or skewed, that P changes. It rotates at an angle matching the object. If the object has been flipped, it turns to an outline. It also leans to match an object that has been skewed.
What I don’t know is why Adobe picked a P. Got a guess? Leave a comment:
Source: This fun tidbit comes from the September 2008 issue of Design Tools Monthly. Creativetechs clients receive a complimentary subscription to Design Tools Monthly in every monthly care package. (This tip dedicated to Marie, who lobbied for more animated gifs in the weekly email. You got it Marie!)