WordReference Random House Unabridged Dictionary of American English © 2026
pound′ sign′, 
    1. Currencya symbol (£) for "pound'' or "pounds'' as a monetary unit of the United Kingdom.
    2. a symbol (#) for "pound'' or "pounds'' as a unit of weight or mass:20# bond paper stock.
    3. the symbol (#) used for various purposes.
    Cf. hash mark, number sign, space mark. 
'pound sign' also found in these entries (note: many are not synonyms or translations):
number sign - space mark
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