this post was submitted on 30 Jan 2024
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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
Interesting. International organizations like WHO, ICCBBA, and ISBT all use the letter O, not zero. I wonder why German-speaking countries have chosen the opposite.
Perhaps because the 0 group is literally the absence or zero presence of antigens A or B, and it was usually identified by zero reactance to lab tests. It was also discovered in Austria, which is perhaps why Germanic adjacent countries use the zero, it was probably the first version. And when translated for the rest of the world someone made a typo and since the difference is immaterial it stuck. Or perhaps because it looked weird to mix letters and numbers that way in a classification system. Nomenclature systems are pretty arbitrary. It's weird what stays and what changes.
Somehow a pretty meta level joke if not only the rabbit but the entire international system of bloodtypes is possibly based on a typ0. 😂
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.
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).
Norway uses zero as well. Don't know exactly why, but using zero does roll easier off the tongue when pronounced in Norwegian, and the name makes logical sense.
Same in Hungary.
No, it is zero, because it behaves neutral towards A and B.
No, at one point a German physician suggested using zero, as it contains no antigens. But Karl Landsteiner, who proposed the eventual system that would come to be used around the world, suggested "O" for "ohne," meaning "without"--as in, without antigens.
How can you be so wrong in one sentence
Watch this:
The quick dog jumps over the lazy brown fox.
This hurt my brain.
Do people say type (number) one/zero? I’ve always heard it as Type (Letter) O.
Cos you’ve got stuff like type A and B.
Wikipedia says:
It's either A, B, AB or none of it, so zero/null.
The Wikipedia quote is misleading - some European countries used zero/null but it was agreed that the prevailing usage should be the letter O.
Wiki source 12
Apparently, it was originally C and changed later, too.
Norway does a weird mix
Denmark uses zero
Haven't bothered looking up the rest of Europe, but the links to other languages on https://en.m.wikipedia.org/wiki/ABO_blood_group_system are a mix of both O and 0.