Rotate (known as rotatecw and rotateccw) is a Custom Block effect available in the Workshop. When applied, it causes the custom block to rotate in one direction along its Y-axis. The direction of rotation is dependent upon the name- rotatecw means 'Rotate Clockwise,' and rotateccw means 'Rotate Counter-Clockwise.' This rotation does not move objects.
Rotatecw and Rotateccw behaviours were released in the 1.099b patch.