OK, there's a few. One are numbers, indicated by slashes, with each multiple of five being a half moon which goes upward. There's line the switch, which is a horizontal circular motion (Like lining a switch). Then there's pull the pin which is a lantern raised over your head. Then there's a kick sign which is a rapid circular movement with the lantern and a slash groundward all in one motion. A drop is the opposite sign. When the field man is ready for the kick, you shine your light at the foreman and wiggle it slightly to indicate that you're ready. You make a downward half circle and point the lantern toward a joint or air joint to indicate that you are going between the equipment and you leave your lantern on the ground. Any lantern on the ground (In the dirt) is to be interpreted as an emergency stop, as the owner no longer has posession of it and could be between the equipment, hurt or dead.
Then there's the signal to shove or pull a track, which are extensions of the daylight signs, as is the "Clear" sign, indicating that the cut or car has cleared the lead (a slight horizontal wiggle of the lantern).
And then there's the most important, that's the sign to tie up and go home (Like the "Pin" sign).
Those are a few.
Rick