What does this symbol mean?

• Sep 21, 2022 - 16:15

...and how do I add it to a bar?


That is "slash notation" - more specifically, "rhythmic slash notation". That's basically a special representation of a whole note that means, don't play this specific pitch, but play the chord symbol marked above using a whole note.

To add it your score, add a regular whole then select it and Tools / Toggle Rhythmic Slash Notation. For more info on slash notation, see the Handbook section on Tools

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