That's O, which is actually the most common. The rarest is AB, which can get from A, B, AB, or O, but can only give to AB.
For those interested:
O+ 38%
A+ 34%
B+ 9%
O- 7%
A- 6%
AB+ 3%
B- 2%
AB- 1%
^
In the US
When I gave blood, me, my brother, and a few other people were racing to see who could fill up their bag the fastest

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Ah. I see. No matter...I asked mi madre and she said I was AB. Goes to show how much I know about my blood xP