It is a given fact that I cannot number the appendicies (i.e., back-matter) in my works/book by continuing the arabic numbering from the main-matter. The reason is that the main-matter numbering is continued from a previous works and will continue in the next works, and the appendicies have to be omitted from this numbering. What is the prefered way to number the back-matter in this case? The front-matter is numbered by roman numerals.
I'm using LaTeX, I know that I can use basically whatever I want, however, I would prefer to follow the English typography traditions as much as possible.