What do you call that symbol? Number sign? Numeral sign? Pound sign? This came up for Victoria, one of our translators, who was doing a recording in Spanish. Each of our native Spanish speakers came up with a different word or expression.
Webster's Online Dictionary has a great page with names, history, meanings, and translations. In English:
• comment sign - computer languages
• crosshatch - what it looks like
• fence, gate, grid, gridlet - what it looks like
• hash / hash mark / hash sign - most common English except for US
• hex - programming
• mesh
• octothorp / octothorpe / octathorp / octatherp -
Huh?
• pound - US, never in UK
• sharp - music (not exact but the best thing a keyboard has)
• space - editors for proofing
In Spanish the options are: numeral, cardinal, cuadradillo, almohadilla ("cushion"), michi, gato, tatetí (the last three meaning "tic-tac-toe")
I like the Italian as well: cancelletto (small gate)
Check the Webster's page for other languages and an interesting discussion.