What is an arbitrary symbol? In order to use the special characters of word. Take Word20 16 as an example, the specific steps are as follows:

1, create a new word and open it, and then click Insert;

2, then click on the symbol/other symbols;

3. In the symbol window that pops up, select "Cambria Math" as the font and "Mathematical Operator" as the subset;

4. Then you can see any of the following symbols and click Insert/Close;

5. After closing the symbol window, you can enter any symbol, as shown below.