Good to know. Intuitively I do this. I never knew it was actually a mudra. "... Dhyani Mudra: In this mudra, the back of the right hand rests on the palm of the other in such a way that the tips of the thumbs lightly touch one another. The hands rest in the lap. The right hand, resting on top, symbolizes the state of enlightenment; the other hand, resting below, the world of appearance."
ohm. Om is beyond all boundaries. Scientists find a hum with their radio telescopes in every direction of outer space - these men of science believe that they are hearing the creation of our Universe. Mystics would say that the Primordial First Act was the split from the One into two. These uneven parts were balanced in the Golden Section ratio (about 1 to 1.6) . This ratio is central to harmony in music and art. And this is Om.