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What is a character that looks like space but no space? (not a & nbsp;)

I’m not talking about  , but about another character "that looks like" "even in the text area, but this other character (separating a line with a space character does NOT divide hello world into two words).

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  or one of them below, perhaps?

http://www.w3.org/TR/html4/sgml/entities.html

<!-- General Punctuation -->
<!ENTITY ensp    CDATA "&#8194;" -- en space, U+2002 ISOpub -->
<!ENTITY emsp    CDATA "&#8195;" -- em space, U+2003 ISOpub -->
<!ENTITY thinsp  CDATA "&#8201;" -- thin space, U+2009 ISOpub -->
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in previous DOS times, char 255 was an empty character

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Unicode, .

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rawurlencode():

echo rawurlencode("whatever string with any \05 \02 weird symbols");

, %

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