What can it be?

Hello, there is a saying that you can pinch and calculate, so superstitious people refer to the ability to pinch and calculate, and generally refer to the ability to speculate on the development of things and predict the future.

Finger refers to the five branches at the front of the finger, and pinching is one of the latter methods. You can point your thumb at other prominent numbers to indicate good or bad luck or calculate the main branch, and point your thumb at other fingers to calculate. In this way, you can know the description in advance without divination, which is predictive.