How was Harry's scar useful as Dumbledore expected?

‘He’ll have that scar for ever.’
‘Couldn’t you do something about it, Dumbledore?’ [said McGonagall]
‘Even if I could, I wouldn’t. Scars can come in useful. I have one myself above my left knee which is a perfect map of the London Underground. Well – give him here, Hagrid – we’d better get this over with.’
_{**Philosopher's Stone* - page 17 - Bloomsbury - chapter one, The Boy Who Lived}

I see Harry's scar as the spot where Voldemort's curse hit Harry, and a source of pain for him as the bit of Voldemort's soul sometimes attempts to exit Harry and rejoin its master.

How else is Harry's scar useful?

_{I'd prefer a canon-based answer (the books, J.K. Rowling interviews, Pottermore) but a subjective answer in the spirit of canon is perfectly fine.}

Harry Potter - Scar

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