Transform Tool in Photoshop

Transform submenu commands

Scale
Enlarges or reduces an item relative to its reference point, the fixed point around which transformations are performed. You can scale horizontally, vertically, or both horizontally and vertically.

 Rotate
Turns an item around a reference point. By default, this point is at the center of the object; however, you can move it to another location.

 Skew
Slants an item vertically and horizontally.

 Distort
Stretches an item in all directions.

Perspective
Applies one‑point perspective to an item.

 Warp
Manipulates the shape of an item.

Rotate 180, Rotate 90 CW, Rotate 90 CCW
Rotates the item by the specified number of degrees, either clockwise or counterclockwise.

Flip
Flips the item vertically or horizontally.

To learn more about transforming objects in Photoshop go to:
http://helpx.adobe.com/photoshop/using/transforming-objects.html