原文链接：https://www.officetooltips.com/powerpoint_2016/tips/how_to_insert_the_mathematical_and_other_symbols_into_the_powerpoint_slide.html

 1.    In the slide where you want to insert the symbol, click Alt+ to insert equitation:

 2.    In the equitation without any additional actions, enter any of symbols that you need using a \+Name of the symbol. E.g.,

If you want to see big symbol, enter \bigcup: 

 3.    After entering the symbol, click the space, it changed entering name to the appropriate symbol.

4.    Click Alt+= again to exit from the equitation.