What does the number in parentheses shown after Unix command names in manpages mean?

What does the number in parentheses shown after Unix command names in manpages mean?

linux unix command-line manpage

unix

How to read a .man file not on manpath?

unix manpage

unix

Linux/Unix man page syntax conventions

linux unix manpage

unix

Why do programs in Unix-like environments have numbers after their name? [duplicate]

unix manpage

unix

Convert all Linux man pages to text / html or markdown

html linux unix markdown manpage

unix

Where to view man pages for Bash builtin commands?

bash shell unix manpage

unix

what is a regular file on unix

file unix manpage

unix

PROGNAME(x) references in manpages -- What does the digit in ()s mean? [duplicate]

unix manpage

unix

Why are *nix commands referred to as Man(1), Diff(1), Cat(1), etc [duplicate]

linux unix command-line manpage

unix

Distinguishing a pipe from a file in Unix

c unix file pipe manpage

unix

What tools are available to edit manpages, i.e. GUI WYSIWYG editors (any platform)

unix editor manpage troff

unix

Display man page from stdin

shell unix pipe manpage

unix

How to make a man page for my shell script?

linux bash shell unix manpage

unix

UNIX System Call Listing?

unix operating-system manpage

unix

Best practices to put into a man page

linux unix manpage

unix