Unicode "no-op" Character?

Mark Davis ☕️ via Unicode unicode at unicode.org
Sat Jun 22 03:37:12 CDT 2019

There nothing like what you are describing. Examples:

   1. Display — There are a few of the Default Ignorables that are always
   treated as invisible, and have little effect on other characters. However,
   even those will generally interfere with the display of sequences (be
   between 'q' and U+0308 ( q̈ ); within emoji sequences, within ligatures,
   etc), line break, etc.
   2. Interpretation — There is no character that would always be ignored
   by all processes. Some processes may ignore some characters (eg a search
   indexer may ignore most default ignorables), but there is nothing that all
   processes will ignore.

The only exception would be if some cooperating processes that had agreed
beforehand to strip some particular character.


On Sat, Jun 22, 2019 at 6:49 AM Sławomir Osipiuk via Unicode <
unicode at unicode.org> wrote:

> Does Unicode include a character that does nothing at all? I’m talking
> about something that can be used for padding data without affecting
> interpretation of other characters, including combining chars and
> ligatures. I.e. a character that could hypothetically be inserted between a
> latin E and a combining acute and still produce É. The historical
> description of U+0016 SYNCHRONOUS IDLE seems like pretty much exactly what
> I want. It only has one slight disadvantage: it doesn’t work. All software
> I’ve tried displays it as an unknown character and it definitely breaks up
> combinations. And U+0000 NULL seems even worse.
> I can imagine the answer is that this thing I’m looking for isn’t a
> character at all and so should be the business of “a higher-level protocol”
> and not what Unicode was made for… but Unicode does include some odd things
> so I wonder if there is something like that regardless. Can anyone offer
> any suggestions?
> Sławomir Osipiuk
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