I want to describe this motion with words. What would be the concise way?
(Actually it's this motion but with the hands closer to the lap than the face but that's not very important)
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Tented hands or tented fingers.
Here is a Slate.com blog post with this caption and image:
How did finger-tenting become a symbol of evil?
David Foster Wallace calls this making hand cages, or pyramids, or shapes in "Brief Interviews with Hideous Men" in the context of a woman visiting her therapist.