About table column names.

Hi the list !
As far as I know, column names for a table can't contain any space,
tabs, and other sort of "exotic" characters. Is there a way to add a
description of a table column anywhere in postgres tables, or does it
have to be handled manually by creating a custum table handling this
kind of datas ? Thanks by advance for any suggestion.
-- 
David BOURIAUD
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