When the fingers in Chakra hasta are bent in such a way that there is a hollow at the center of the palm we get the Samputa Hasta.
lets take a look at the viniyoga shloka of Samputa
Varvacgade sampute cha samputah krah iritaha
It says that Samputa is used to denote
1. Concealment of objects. It can be used to show secrets or something that is kept safely. it can also denote something that is hidden.
2. To show the chest.