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Sorry, I was thinking of the em — and en – dash. An is a non-breaking space though you could also be using  ,  ,  ,  ,  ,   or   for other width spaces and other than the ‍, they do display as spaces of varying width so I don't think of them as non-displaying—I reserve that for characters that have no visible effect such as the ‍.
I seldom using the non-breaking space so I've never worried about seeing them.
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