How do I add an uppercase asterisk in MS Word formula editor

A couple of formulas I made in the MS Word formula editor

However, the last (*) should be exactly that: an asterisk, not a multiplication sign. I want it be higher - it's there for a note that says that in certain conditions the last term (ОФО) is not used in the formula.

The formula editor automatically turns * into a multiplication sign - how do I avoid that in this particular case?

You can force Word to interpret * as a character - not a mathematical symbol. Write: "*" with quotes

I'm not sure that's the cleanest solution, but u can make asterisk as upper index of the left bracket. (^* and then just write the right bracket.