Using the input method installed in the computer, you can directly type the pinyin "chu" of the word "except" when you input, and then you can see the "∫" symbol, and click to select it.

Method 2:

1. This function can be realized by using the soft keyboard of the input method. First, right-click the input method installed in the computer.

2. Click "Soft Keyboard" in the pop-up options.

3. Then select the "Mathematical Symbol" option in the "Soft Keyboard".

4. You can call the "Mathematical Symbol" soft keyboard. The keyboard corresponding to the "∫" symbol in the soft keyboard is "T". You can type the ⊙ symbol directly.