2. Then enter the Excel table and select the Insert option on the menu bar.

3. Select the symbol option on the far right of the menu bar to enter.

4. In the entry symbol, select the small triangle next to the subset in the drop-down box, and select other symbols to see the symbols with five-pointed stars.

5. Then choose other options for the triangle drop-down, such as the tab symbol, which will have poor options.

6. Select the symbol of mathematical operation in the drop-down box to tick.

7. Finally, click the corresponding symbol to insert it into the Excel table.