JSP notes marginal characters in BOA manuscripts, says they come from papyri and other unknown sources.
"Introduction to Book of Abraham Manuscripts, circa July–circa November 1835," The Joseph Smith Papers website, accessed September 23, 2021
The three manuscripts created by Williams, Parrish, and Phelps are also related to JS’s efforts to study the Egyptian language. In the Book of Abraham manuscripts, characters from the papyri and other sources were copied in the margins next to passages of English text—as was done on the Egyptian Alphabet documents and Grammar and Alphabet volume. The text was presented in columns rather than in a single block, as was done in the Book of Mormon manuscript. The Williams and Parrish manuscripts also contain titles similar to those found in the Egyptian Alphabet documents.