The right-left of clasping hands

I meant the latter. But “right arm” is my answer to both your questions. :confused:

I do most things with my right hand. Including carrying a bag despite that an awkward shift will be needed so my right hand can use key to open door. :smack:

Hmm. I can cross my arms so as to produce that effect, but it takes an effort, and deliberately raising my elbows up. When I cross my arms naturally, my right hand is on top of my left arm in both senses, but my left hand and part of my left forearm are closer to the ceiling than my right arm and forearm; and most of my right arm is lower to the ground, it’s coming up from below to cross over the left arm.

I can easily also cross my arms the other way around, which apparently some people find awkward; but if I do it without thinking about it at all, the right hand winds up on top – actually, if I do it the other way around, it’s hard to say which is on top; they’re about equal – each hand is on top of the other forearm, and the forearms are close to horizontal with each other.

I just tried it four different ways: right arm on top - right thumb on top ,right arm - left thumb, left arm - right thumb, and left arm - left thumb.

Results: right finger on left side of nose and left finger on right side no matter how I started. And I still could uncross my arms from any of them.

When Ms. P and I hold hands (usually, but not always, my left and her right) my thumb is on top. Our son and his girl friend don’t usually clasp hands when they’re holding hands. Maybe that’s because their hands are closer in size than mine and Ms. P’s.