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Date:   Mon, 12 Dec 2022 14:57:05 +0100
From:   "Andries E. Brouwer" <aeb@cwi.nl>
To:     "G. Branden Robinson" <g.branden.robinson@gmail.com>
Cc:     Alejandro Colomar <alx.manpages@gmail.com>,
        Colin Watson <cjwatson@debian.org>,
        Ingo Schwarze <schwarze@usta.de>,
        linux-man <linux-man@vger.kernel.org>, groff@gnu.org,
        Michael Haardt <michael@moria.de>,
        Andries Brouwer <Andries.Brouwer@cwi.nl>,
        Michael Kerrisk <mtk.manpages@gmail.com>,
        Douglas McIlroy <douglas.mcilroy@dartmouth.edu>,
        "Andries E. Brouwer" <aeb@cwi.nl>
Subject: Re: Ping^1: Chapters of the manual (was: Bug#1018737:
 /usr/bin/rst2man: rst2man: .TH 5th field shouldn't be empty)
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On Mon, Dec 12, 2022 at 07:19:22AM -0600, G. Branden Robinson wrote:

> The 4.2BSD provenance is particularly valuable, in that it illustrates
> how the terminology was retained

Earlier I replied and showed a snapshot of the history.
Contemporary:

https://www.freebsd.org/cgi/man.cgi
All Sections

https://man.openbsd.org
All Sections

A random Oracle man page for SunOS:
man pages section 2: System Calls

https://developer.apple.com/documentation/os/reading_unix_manual_pages
"Section 1 of the man pages covers command-line tools, section 2 covers system calls, section 3 covers user-space libraries, and so on."

Etc.

It may be true that there was historical use of "chapter", but
all common places today have "section".

Andries