pound sign
US /ˈpaʊnd saɪn/
UK /ˈpaʊnd saɪn/

1.
cancelletto, simbolo cancelletto
the symbol #, used for various purposes, such as indicating a number, a hashtag, or a telephone key
:
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Press the pound sign to confirm your selection.
Premi il cancelletto per confermare la tua selezione.
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Use the pound sign to create a hashtag on social media.
Usa il cancelletto per creare un hashtag sui social media.