"You write code comments using the hashtag key"
"Oh, they mean a *hash* key?"
"Why do you call it a hashtag, if you also call it a pound sign?" #idontknowhttps://twitter.com/starsandrobots/status/849303447501406211 …
Just handed my phone to help a pal visiting from South Africa make a call, only to hear a panicked "what do they mean, a pound sign?" #£ 
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It's really called an octothorpe. http://www.computerhope.com/jargon/o/octothor.htm …
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I still remember when it meant "number"
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Is it 'cause the British got to it, first?
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"#" used to be a more popular shorthand for "pounds" (weight). Still see it around in smaller/older grocery stores.
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