The OpenBSD manual has nine sections, and each man page appears in only one section. These sections are sometimes called volumes, a name from the days when the manual was small enough to print and distribute. Each section covers a single topic. The sections are as follows:
1: General commands
2: System calls and error numbers
3: C libraries
3p: Perl libraries
4: Device drivers
5: File formats
6: Games
7: Miscellaneous
8: System maintenance and management commands
9: Kernel internals
Man pages often appear with the section number in parentheses after the command, such as ping(8) or ed(1). This gives you the name of the command (ping) and the section where the command is documented (8, on system maintenance). Almost every part of OpenBSD has a man page.
Absolute OpenBSD: UNIX for the practical paranoid / Michael W. Lucas.
