The ROTATE command spins an object(s) about the Z axis. To rotate an object, do one of the following: 
Choose Rotate from the Modify drop down menu.
On a toolbar, click the Rotate tool. 
Type ROTATE or RO in the command line and then press Enter.  
Select the entity right click and select Rotate.

Tip: The ROTATE command can be used to generate a circular array. Hold the SHIFT key down while copying around a center point.

Rotate by handle  This movie shows how to effect a quick rotation of an entity. We use the handle of a block to vary the rotation angle of blocks indicating massed planting.

Rotate by handle