When someone pours you tea and wine, what do you mean by tapping your finger twice on the table?

The most common way to say "thank you" is to knock on the table, which is also called "clapping ceremony".

Hand knocking ceremony is a kind of ceremony in China tea ceremony. It is said that at that time, the Qianlong brothers were naughty, went out incognito in Jiangnan, and ate at the same table with courtiers. They had a big temper. He actually picked up a teapot and poured tea for a group of Ai Qing, which startled the courtiers and got up to thank the Qianlong brothers.

But I can't help going out incognito, so it's easy to expose my identity by kneeling collectively. So he had a brainwave, slightly bent his index finger and middle finger, knocked on the table a few times, made a buttoning sound, knelt down with his fingers and kowtowed.

Later, the story spread slowly, and the high-five ceremony gradually became popular among ordinary people from the initial etiquette of monarch and minister, and it was quite particular.

Extended data:

There are three formal knocking ceremonies. The first is the ceremony that the younger generation gives to the older generation. Five fingers should be put together into a fist shape, with the back of the fist facing upwards, and the five fingers should tap the desktop three times at the same time, indicating prone position.

The second is the salute between peers, which is relatively simple. Just put your index finger and middle finger together and tap it three times next to the teacup to show respect.

The last one is the tribute of the elders to the younger generation. Because the position is relatively high, the salute of the elders should not be so grand. Just tap on the edge of the teacup with one finger.

References:

Baidu encyclopedia-clapping ceremony