While your hands are in Mrigashirsha mudra, bending your thumb along with the other fingers will lead to Hansapakshikaa.
Shatasankyayam Sethubandhay nakharekhankanay tatha
pidhanay hansapakshoyam kathitau bharatagamay
It is used to denote the following :-
- Shatasankyayam: Number six
- Sethubandhay: Construction of a bridge
- nakharekhankanay: Engraving with nails
- pidhanay : to cover