Unicode "no-op" Character?

[Richard Wordingham via Unicode]

On Sat, 22 Jun 2019 21:10:08 -0400
Sławomir Osipiuk via Unicode <unicode at unicode.org> wrote:

> In fact, that might be the best description: It's not just an
> "ignorable", it's a "discardable". Unicode doesn't have that, does it?

No, though the byte order mark at the start of a file comes close.
Discardables are a security risk, as security filters may find it hard
to take them into account.

Richard.