Refer to figure.
The given marshaller signal indicates to the pilot(s) to turn right. The rate of the motion of the marshaller arm indicates the rate the aircraft has to turn with.

ICAO Annex 2 - Appendix 1
5 b). Turn right (from pilot’s point of view)

With left arm and wand extended at a 90-degree angle to body, make “come ahead” signal with right hand. The rate of signal motion indicates to pilot the rate of aircraft turn.