The following images are industry recognised hand signals for people directing the movement of lifting equipment.
You must not signal plant operators unless you are trained and authorised to do so.
The signaller should stand in a safe position, where they can see the load and can be seen clearly by the lifting equipment operator. They should face the operator if possible. Each signal should be distinct and clear. These signals have been reproduced from Schedule 1 of Health and Safety (Signs and Signals) Regulations.