In numerology, you assign numbers to each letter of the alphabet: a=1, b=2, c=3 ... z=26, to find hidden meanings in text. Applying this to LATE (what Charlie writes on his bandages):
12x1x20x5=1200. 1200 can be divided by 4, 8, 15 and 16, which are almost all The Numbers. Plus, those are 4 numbers. Once again, 4 is one of The Numbers.