Is there any allusion to the word "pinch your fingers and calculate"?

It seems mysterious to show the fortune teller "when I pinch my finger". In fact, this is just a way to calculate heavenly stems and earthly branches.

Pinch your fingers-the introduction is "wait for me to pinch my fingers" to the fortune teller, which seems mysterious. In fact, this is just a way to calculate heavenly stems and earthly branches:

The cooperation between 12 heavenly stems and 10 earthly branches generally requires a pen and paper, but the ancients rarely had the opportunity to use pen and paper when calculating numerology. So divide your fingers into three sections, just fix them for twelve days, and read the earthly branches according to the knuckles when matching them, so that you can quickly calculate the heavenly stems and earthly branches of the year and month, and pinch your fingers to count.