The mathematical symbol "pai" is expressed as π. In Word, the input method is:

Method 1:

1, click insert-> symbol-> other symbols, as shown in the figure;

2. The symbol dialog box pops up, and you can insert the symbol as shown in the figure.

Method 2: Take Sogou Pinyin Input Method as an example.

1. Click the right mouse button on the input method soft keyboard to pop up a shortcut menu, and select Greek alphanumeric characters, as shown in the figure;

2. The Greek alphabet soft keyboard pops up, click the key with the mouse, and the symbol as shown in the figure will appear.