Visio 2010 - Unidentified Line with "center of rotation" handle

I opened up my VSD file and saw a line which I did not place there.  (See graphic).  This is a horizontal line with a small handle that says "center of rotation" when I hover my mouse on top of it.  

What is it?  Never seen it before?
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Hi BT,

That is a Guide. You might have accidentally created one when resizing a window. You can pull horizontal and vertical guides off of the rulers. Shapes will snap and glue to guides, so they can be a convenient mechanism for aligning rows or columns of shapes, and then adjusting them later on.

Guides don't print, and won't really mess up your drawing in any way, except if you glue shapes to them, then move the guides, of course. If you don't need it, you can select it and delete it like any other shape.

With the dynamic grid that has steadily improved from version to version, guides have become less important. I still use them to layout rooms when I'm creating a floor plan. It's easier to make a grid of guides, precisely spaced from each other, then trace over them with wall shapes.

Hope this helps!

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brothertruffle880Author Commented:
Thank you.  Excellent explanation of what they are.
brothertruffle880Author Commented:
BTW.  What does "center of rotation" do in that guide line?
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