this post was submitted on 30 Jan 2024
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Dad Jokes
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Hint: You have to read it as "Type O" not 0/Zero/Null. Took me quite long ;)
The blood type is explicitly the letter. O, along with A, B, and AB.
In Germany the blood types are A, B, AB and 0 (zero). That's where my confusion came from: https://de.m.wikipedia.org/wiki/AB0-System
Same in Hungary.