so i did some more research and found that the 121 written on the paper pointing the zombie's "backpack" is 121, it actually has a faded dote in between the 1 and 2 making it 1.21
ALSO: there is aslightly faded "GW" to the right of the 1.21, which is short for "gigawatt". so it actually reads "1.21 gigawatts".

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you may have heard of 1.21 gigawatts from the movie "back to the future" but this actually might have a zombie significance. the wikipedia page says:

"A gigawatt is equal to 1,210,000,000 watts which, to give a sense of scale, is approximately the output of a single pressurized water reactor at a nuclear power plant. It equates to around 1.6 million (continuous) horsepower, but is only discharged for a moment."

ALSO - richtofen uses the term "1.21 gigawatts" in one of his quotes on ascension.

the quote is: "1.21 gigawatts!...where have i heard that before..."

now you all are thinking "well they are obviously making a reference to Back to the Future".
well...what if he isn't? remember that black ops takes place in the 1960's before the movie was made. what if Richtofen had a hand at creating this monster that we see on this loading screen and that is what he meant when he had heard that before?

then again these are my theories and they are all speculation. we will find out soon enough

Richtofen's quote (go to 1:03):