Les codes de l'invisible

In Unicode there are a lot of invisible characters: regular white-space characters (e.g. U+0020 SPACE), language specific fillers (e.g. U+3164 HANGUL FILLER of the Korean Hangual alphabet), or special characters (e.g. U+2800 BRAILLE PATTERN BLANK). While all of these have a specific meaning in their natural context, they can be used in various applications that don’t allow for regular whitespace characters.
Florian Pigorsch, Unicode characters you can not see, https://invisible-characters.com/

C’est une idée géniale de lister tous les caractères Unicode qui permettent d’exprimer une espace invisible ! Florian Pigorsch propose une cinquantaine de façons différentes de coder une espace invisible.