This is a mudra our pranayama teacher, Sri O. P. Tiwari suggests to open and relax the carotid arteries & basically whole neck region which facilitates smooth breathing.
PS: It’s also said to reduce wrinkles đŸ˜‰
Utile avant le pranayama pour les artères carotidiennes et toute la région de la nuque. ce qui facilite une respiration douce.