Rotation numbers in mapping

I thought i'd seen a number of years back some tables for rotation numbers within the editor. So to get an item properly rotated at perfect 90* angles. Does anyone know these numbers or have a link where these can be found?
 
I haven't gone by that moniker since i quit mapping way back then.
I went by lilblackgirl for a while but got hit on too much by 12 year old idiots. (Not the smartest choice on my part).

roadkingclassictexas just lies near and dear to my heart.
 
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