Indeed `man ascii` (on MacOS but the same for Linux for the most part) shows the manpage for 'ASCII(7)' - the '7' denotes the section of the manual the manpage

Indeed `man ascii` (on MacOS but the same for Linux for the most part) shows the manpage for 'ASCII(7)' - the '7' denotes the section of the manual the manpage is from. If you use `man man`, you can see the section numbers and names, e.g. Section 1 General Commands, 5 File Formats, 7 Misc Info, 8 System Manager's Manual. If a word, e.g. 'crontab', has multiple entries in different sections, then you might have to specify the section you want, e.g.`man crontab` shows the crontab(1) (General Command) and use `man -s 5 crontab` to see the crontab(5) (File Format). `apropos crontab` will show entries related to crontab, i.e. cron(8), crontab(1), and crontab(5).