A Curved Index Finger curves inward toward the Middle Finger.
It is an indication of insecurity. And this insecurity is usually expressed by the instinct to collect things.
This finger began to curve inward in the early years
Even as a child, this person will accumulate cards, dinosaurs or stamps and then protect them with his life.
It isn't the acquisition of the object for its own sake, but the need for a security blanket that finds them on a constant search.
Anyone can be a collector for all kinds of reasons, and they can have any sort of index finger formation.
But when you find a Curved Index Finger, you always have a person who collects specifically for the sense of security that it gives.