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http://xahlee.info/comp/unicode_whitespace.html

Unicode Not Whitespace Whitespace
These are Unicode characters that are invisible, but technicaly not considered a whitespace. (they have the property White_Space=no)

name	codepoint (hexadecimal)	codepoint (decimal)
mongolian vowel separator	U+180E	6158
zero width space	U+200B	8203
zero width non-joiner	U+200C	8204
zero width joiner	U+200D	8205
word joiner	U+2060	8288
zero width non-breaking space	U+FEFF	65279
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