2. Click on the symbol of the encyclopedia.

3. Click on the special symbols and punctuation you need to complete the input.

4. There is also a search bar, which can directly search for symbols, such as; If you enter "square" and click Search, two symbols in the following figure will appear.

5. Finally, there are some small accumulations, such as pressing "V" and then "2" on the keyboard, or you can enter some special symbols.