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Trust me, I know for certain! ;)

Of course, they use the palm and fust salute, but not seperated as you described.

Careful with your generalisations. I know that not all HungGar and CLF people do like you described, don't know about Dragon.

That's one version I've heard. Also that it's a representation of yin and yang. I've also heard an explanation that has it as a stylised block and strike.

I've heard lots over the years!