What are the hand signals in volleyball?

In volleyball, some girls at the net will put a hand behind their back and hold up 1 finger or 2 fingers. 1 finger means that they are blocking line and 2 means that they are blocking cross court. Some with their other hand will hold up two or three fingers. Two means that there are only 2 hitters on the other side and that the setter is front row, which means she/he is able to dump. 3 means that there are 3 live hitters on the other team. Some setters will also signal to their hitters what hits they will run. Most teams make up their own hand signals for hits.