Finding:

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   Zero-width space

   The zero-width space (ZWSP) is a non-printing character used in computerized typesetting to indicate word boundaries to text processing systems when using scripts that do not use explicit spacing.
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   Zero-width non-joiner

   Zero-width space
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   Space (punctuation)

   | U+200B | | ​ | Zero Width Space, or ZWSP | General Punctuation | ] [ | Used to indicate word boundaries to text processing systems when using scripts that do not use explicit spacing. |
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   Mapping of Unicode characters

   Word Joiner (U+2060), zero-width joiner (U+200D), zero-width non-joiner (U+200C), zero-width space (U+200B), Combining Grapheme Joiner (U+034F).
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   Word wrap

   Zero-width space
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   HTML element

   It performs the same function as zero width space (HTML entity ​).
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   Word divider

   Zero-width space
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   Byte-order mark

   If a BOM is misinterpreted as an actual character within Unicode text then it will generally be invisible due to the fact it is a zero-width no-break space.
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   Unicode

   Graphic characters are characters defined by Unicode to have a particular semantic, and either have a visible glyph shape or represent a visible space. ... For example, U+200C ZERO WIDTH NON-JOINER and U+200D ZERO WIDTH JOINER may be used to change the default shaping behavior of adjacent characters (e.g. to inhibit ligatures or request ligature formation).
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    Perl Compatible Regular Expressions

    For example, to complete the tests provided with pcretest, 8 mb of stack space would be needed. ... Escape sequences for zero-width assertions

Explore the following pages on Powerset:

• Zero-width space,
• Zero-width non-joiner,
• Space (punctuation),
• Mapping of Unicode characters,
• Word wrap,
• HTML element,
• Word divider,
• Byte-order mark,
• Unicode,
• Perl Compatible Regular Expressions