Space

Whitespace

Standard (a single space) also in source code

Non-breaking space

Prevents an automatic line break at this point:

 

Double-length space

  

Quadruple-length space

  

Invisible, zero-width space

An invisible character with no width that serves as a potential line break point:

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Zero-Width Non-Joiner (ZWNJ)

Prevents certain characters from joining, but remains invisible:

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Zero-Width No-Break Space (ZWNBSP)

Invisible and without the possibility of a line break: