Documented in Volume 1 of the UNIX Programmers Manual.
% man man will list the manual entry for 'man' at the terminal.
% man -k plot shows you all the manual table synopsis lines which contain the keyword 'plot'. (This is what apropos does....)
See /usr/man/man1 (man2,...,man8 for BSD commands and manl for local) for the actual online text.
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