Jai Srila Prabhupada!
BY: SUDARSHAN DAS
Bhaktivedanta Book Trust
Jul 08, 2014 SINGAPORE (SUN)
"Another significant word is tarka mudra. This indicates that the fingers are open and the second finger is raised, along with the arm, to impress the audience with some subject matter. This is actually a symbolic representation."
(Srimad Bhagavatam 4.6.38)