Does this pose, gesture, or whatever, have an "official" name?  And, no, it's not in the Hands Dial-up products. I looked. ;)

We've all seen it, done it (particularly if you have siblings), seems more or less universal, & most likely goes by a different name in each corner of the planet. There's probably already an apt Yiddish word already that I've never heard, but wondering if there's a general consensus.

I asked this on a Discord channel that's frequented predominantly by Europeans and surprisingly got zip other than one person who did an extensive Google search with similar results.

So, now it's become a bit of a challenge I suppose.