NY sports fans

I'm a transplant to NY, so I don't really get the sports mania around here. However, since I was looking at plates starting with numbers yesterday, these are most of the plates that begin with the number 8.

880YNK (on a World Series plate)


846 YAN (on a World Series plate)


824YNK (on a World Series plate)

Anyone more sports-savvy want to take a guess at what the numbers mean?