Method 1: insert with the soft keyboard of the input method.

1. Stop the cursor where you want to insert the symbol, and then click Input Method.

2. Right-click the input method and select "Mathematical Symbol" in "Soft Keyboard".

3. After the dialog box appears, directly click the key of the symbol with the mouse and insert ∵ and ∴ at the cursor position.

Method 2: Insert input method symbols.

1. Stop the cursor where you want to insert the symbol, and then click Input Method.

2. After the input method appears, right-click the symbol and select "Expression &; Symbol ".

3. After the symbol encyclopedia dialog box appears, select "Mathematics/Unit" on the left, find the corresponding symbol in the list, and click Insert.