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PSintend0 said:
1. Is it blood type O?
2. Is it blood type 0?

I´m not from America and the way I learned it was that its really 0, but in common lanquage its way more often O and that basicly nobody says blood type zero.

I get why it would be 0 for zero antigens, but the other two types are A and B, so it just seemed like they should all be letters.  Never really thought about it till now.