Reference Cinema 4D Basic Features BodyPaint 3D UV Edit Menu
Function available in CINEMA 4D Prime, Visualize, Broadcast, Studio & BodyPaint 3D

Rotate UVs Counterclockwise/Clockwise

Moves the sequence of the points for the selected UV polygons up or down one position. Things will still look the same in the Texture view, but on the mapped object the content of the selected polygons will be rotated (either clockwise or anticlockwise depending on which command you choose).