Do glossário em /usr/share/doc/man-db/man-db-manual.txt
(a fonte é manual / glossário .me ):
cat page
A formatted manual page suitable for viewing on a vt100-type terminal.
stray cat page
A cat page that does not have a relative manual page on the system, i.e. only the cat page was supplied or the manual page was removed after the cat page had been created.