%C -- Like %c, but the leftmost column is displayed as one.
%i -- print the size of the buffer.
%I -- like %i, but use k, M, G, etc., to abbreviate.
+ %o -- print percent of window travel through buffer, or Top, Bot or All.
%p -- print percent of buffer above top of window, or Top, Bot or All.
%P -- print percent of buffer above bottom of window, perhaps plus Top,
or print Bottom or All.
+ %q -- print percent of buffer above both the top and the bottom of the
+ window, separated by β-β, or βAllβ.
%n -- print Narrow if appropriate.
%z -- print mnemonics of keyboard, terminal, and buffer coding systems.
%Z -- like %z, but including the end-of-line format.