Love 'em or hate the ten pin is every rt-handed bowlers worst nightmare

anyway, could someone be kind enough to define these for me, thanks!!

1) ringing ten pin

2) weak ten pin

3) flat ten pin

4) insert another one if there are any

while I'm at it, also where did the term "Stone" come from?? like 'he left a stone-8'
I know how to use that particular cool bowling term but I thought that it would be nice to understand it
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Big Jake