How Do I Sending Non Printing Character On Some Apps

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Non-printing character is a code point (a number) in a character set, that does not represent a written symbol. This morning I just thought how to send an empty message on Standuply channel(Slack) Fortunately, I just found an answer at stackexchange, also an article on wikipedia about non-printsing character. It's also working on telegram, whatsapp, and instagram, and it works on slack. So far, I'm able to fill instagram bio, name and address with non printing character.