this post was submitted on 30 Jan 2024
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Dad Jokes

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The nurse asked the rabbit, "What's your blood type?"

"I'm probably a type O," he replied.

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[–] [email protected] 4 points 9 months ago (1 children)

I've read the history of it, and it's added up above in a higher level comment. Both 0 and O were used to refer to the absence of antigens, and it was an Austrian who made the final recommendation that stuck. Which is why it's all the stranger that German-speaking countries kept the zero.

[–] [email protected] 2 points 9 months ago

Just a wild guess by a fellow Austrian: we do not say O instead of 0 (like in phone numbers) in German. So it just makes no sense for average Joe to write an O. There is no connection here (we have the tramway line O though in Vienna).