As an American, I had to work out the Roman Numerals the only way I know how: using Super Bowls. So the 1st Super Bowl is Super Bowl I (Packers over Chiefs), the 2nd Super Bowl is Super Bowl II (Packers over Raiders), and the 50th Super Bowl is Super Bowl 50 (Broncos over Panthers). Putting this together I get:

I II II 50

I’m at a loss as to what it could mean.