What is the section '0P' in man page?

Question

After reading the stdbool.h man page its section number, 0P, drew my attention.

Does it describe *.h files or something like that? I can't find the answer.

Answer 1

Under Linux, at least, the p stands for POSIX.

Section 0p is the header files, 1p is the commands and 3p is the functions.

Answer 2

I actually wasn't familiar with "man 0" - kudos to paxdiablo.

These are the standard "man" sections":

http://en.wikipedia.org/wiki/Man_page#Manual_sections

Section Description
------- -----------
1       General commands
2       System calls
3       Library functions, covering in particular the C standard library
4       Special files (usually devices, those found in /dev) and drivers
5       File formats and conventions
6       Games and screensavers
7       Miscellanea
8       System administration commands and daemons

These are "additional" sections available on some systems (including, apparently, section "0P" on your system:

Section Description
------- -----------
0       C library header files
9       Kernel routines
n       Tcl/Tk keywords
x       The X Window System