Help Please

So...Parker brought this home from school today. I asked him what it was or what the numbers meant or what the letters were and he said,

"well, you see, the E is equal to 0000, the F 0611, the 0 1022, the 7 4000, and the Z 1600"

I just said, "Oh."

I have no idea what the heck he is talking about, but my guess is that it isn't totally random numbers and letters. I'm hoping someone at either the Marcus or Martin homes can figure it out because I think you need a degree in math to get this one. (Oh, wait, I have one. Shit.)