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I don't think there is any special font used for the ASCII art...

You aren't asking for a font that produces ASCII art are you? If so then you might misunderstand how ASCII art is produced.

I think you're the one misunderstanding things here. There are most certainly such things as ASCII art fonts. Here's a very simple one: https://gist.github.com/dmd/6c57d30c1a38c611a99b

You're quite confused - please see my response, but he was looking for the FIGLET fonts that produced the "ascii art" text.