Where I live each different wave has a different meaning. One finger wave is, "hey". Two fingers is, "hey, how ya doing". Three fingers is, "hello ol buddy". Four fingers is, "hey pal, come over sometime for a beer". All five fingers is, "how's your mom-n-them"? LOL!!
The one finger, the index finger, is the common wave here. They teach this to their kids as a way to keep both hands on the wheel in these hillbilly winding mountain roads. But back in Louisiana, as a kid we always had one arm out the open window and waved with it. Right hand stayed on the wheel.
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