2. In the text editing bar, press the shift+V key combination on the keyboard (if it is full spelling mode, you can press the V key directly).
3. Click the symbol icon on the right side of the pop-up dialog box.
4. At the top of the pop-up window, select the math option.
5. In the mathematical symbol column, select the desired symbol.
6. Click the selected symbol to enter it in the text box.