This is an Egyptian papyrus document written in coptic script. For those of you wondering what happened to the hieroglyphics, I'll tell you this: they weren't Egypt's only forms of communication. Everything written that was NOT part of public show was done in either Hieratic or Coptic script because they are compacted adjustments from the traditional pictograms of the hieroglyphs-- faster and easier to write, and requiring less space.
Egyptian was the international language of its day; all foreign correspondence between kings was written in coptic. Educated merchants and scribes across the Middle East used it for international trade. "Laundry lists" and receipts have been found by archaeologists recently attesting to this fact.
I wore a gleeful grin on my face one day in November when I put two and two together. Reformed Egyptian? ahem.
Not only does this writing style take up a smaller amount of space than anything else of its time (way less than Hebrew--trust me!), it also allows for foreign words to be included. And because it was used internationally, in 600 BC it would have been the way to communicate to the largest worldwide audience. If I were Nephi it would TOTALLY make sense to write my record in script. So whether or not Coptic is the "reformed egyptian" we know of, it may very well be close.