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Go to Insert and select Symbol.
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Choose a symbol. If it isn't expanded, select the Expand button on the right corner of the gallery.
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Double click the symbol you want and close the symbol gallery.
Inserting a symbol isn't currently possible in Excel for the web. You can, however, insert a symbol in the Excel desktop app.
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To open the desktop app, at the top of the ribbon, select Editing > Open in Desktop App.
Don't have the Excel desktop app? Try or buy Microsoft 365.