While doing Shikhara mudra, bending the pointer finger and pressing it over the thumb is the Kapitta mudra.

It is used to denote the following:-

Goddess Lakshmi and Saraswati
Milking Cows
Holding Cymbals
Holding Flowers at the time of making Love.
Grasping the end of the robes
Offering Insense or Light
Collyrium (applying Kajal)