I saw this

strange character online. I also noted that:

  1. It needs 26 backspaces to delete but behaves like one character when selecting.
  2. It is drawn vertically covering many rows above.
    Strange looking character
    What is this character and why is it behaving like this ?

It's stacked diacritics on top of one another, as seen here, and in the infamous zalgo text; in this case stacked accents used in many non-English Latin-based languages.

Specifically, it seems to be a tilde, used as an accent.

Credit where credit is due, it uses the same techniques used for the faces in this question.

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