'Explanation on [ (n) ] or [ fields ] [ (p) ] in PostgreSQL docs

I'm reading through the PostgreSQL docs and didn't find examples or explanations on the syntax used there. For example on the documentation page for data types you find a table having [ (n) ] and similar. Could somebody please explain or provide examples what all of those for me crypting symbols mean?

Thanks in advance.

postgresqldocumentation


Solution 1:[1]

The syntax is described in the Conventions page of the manual.

For instance, [(n)] means that optionally there is a numeric value in parentheses.

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Source: Stack Overflow

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Solution 1 Renzo

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