First open the input method, and you can see six icons. draw
Second, the sixth toolbox, click the button on the left, as shown,
Third, select Symbolic Encyclopedia, and click the numerical serial number to select the Roman serial number. draw
The functions of the universal input method (as shown in the floating window) are, from left to right, custom status bar, Chinese-English switching, Chinese-English punctuation switching, entertainment switching, personal center and toolbar. Custom status allows you to log in to your personal account and select a different skin; Switching between Chinese and English and punctuation between Chinese and English are common functions; Personal center can record personal history and other information; Toolbars include various symbols, whether mathematical symbols, Chinese symbols, digital symbols, etc. You can find it here and choose to use it.