This question already has an answer here:
- What do the numbers in a man page mean? 8 answers
I have seen on many occasions a name of a function (frankly speaking I just call it function because of it typical appearance, they are though sometimes named commands or system calls but I do not know the idea behind labelling them differently), which contains a number within the brackets part of it, like in exec(1) exec(2) exec(3).
What is the meaning behind putting numbers into them ?