Hold down Alt and type 0216 then release Alt...
Also..
Right hand side of the text dialog box hit the dropdown for "Insert Symbol" and you can either use the Windows Character Map (Alt + 0216) and find it there or it looks like its the one that Inventor has listed as the "Diameter" symbol lower down in the list there (2nd or 4th symbol grouping)..
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Inventor 2023 - Dell Precision 5570
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