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A priest, a pastor, and a rabbit entered a clinic to donate blood
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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.