What is a “noise word” in postgres-speak?

Question

I was reading the postgres documentation here . What does the word "noise" mean in this context?

This command allows retrieval of system status indicators. CURRENT is a noise word

Answer 1

A "noise" word is something that isn't required and doesn't add anything to the functionality or change the outcome of the statement or command.

Eg outer is also considered a "noise" word, because there is absolutely no difference between left join and left outer join - so the outer just adds "noise".