The Hidden Character

Quite an interesting discovery I recently made: there is a hidden character code used to tell in a Unicode file which byte-order multibyte characters have. Basically the character is invisible (“zero-width and non-breaking”) to most editors, which is why it is sometimes useful for other things, such as floating an item to the top of a sorted list. The hex code of this invisible character is #FEFF or #FFFE and can be written in HTML using an escape sequence such as . Use with caution.