Operating steps: a. Open mathtype6.9b software:

B. Click the "Edit" button in the upper left corner:

C. Click the "Insert Symbol" button to display this interface:

Select Euclid Math II from the drop-down tab after the font:

Then select the symbol you want to use below, and then copy and insert the text.

(Attachment: When installing Mathtype, it will be automatically installed in office as a plug-in and can be used directly. You still select the above fonts and symbols in "Other symbols". )