Have a lock with a circle around it couldn't find it in the book

That means that rotation is locked. The screen will not reorient when you turn your iPad.

See this for information on how this works: http://support.apple.com/kb/HT4085?viewlocale=en_US&locale=en_US

There are two ways orientation can get locked. Most likely you inadvertently switched the lock on by sliding the little switch next to the volume rocker switch on the side of your iPad.

There is also a Setting that can be set to lock screen orientation.