I just checked what is easily available to me:
v7 calls them sections in intro pages, but chapters in man(1) and man(7).
Celerity Computing UNIX (looks like a BSD port) calls them sections in
intro pages and man(7), but chapter in manv(7) (dtroff version of man(7)).
SunOS 4.1.1 calls them sectio
> Admittedly, it's hard to defend my proposal as _necessary_. Especially after
> the world has lived for decades with the ambiguity of having chapters as
> sections and sections also as... sections.
Well, one are the volume sections and the other manpage sections. :)
Originally, Unix documenta