Analysis: Sitting around means sitting in a circle, and the hot pot mouth and hot pot are also round, so the circle is represented by 0.

The main features of Chinese characters in crossword puzzles can only be vividly expressed by the images of things. It is not popular to pile up long, obscure and boring conceptual terms.

Extended data

Digital origin

Around 500 A.D., with the rise and development of economy and caste system, Punjab in the northwest of Indian subcontinent has been in a leading position in mathematics. Astronomer Ayepihite made a new breakthrough in simplifying numbers: he recorded the numbers with a grid. If there is a symbol in the first grid, such as a point representing 1, then the same point in the second grid represents ten, and the point in the third grid represents one hundred.

In this way, not only the digital symbols themselves, but also their position order is of great significance. Later, Indian scholars introduced the symbol zero. It can be said that these symbols and representations are the old ancestors of Arabic numerals.