Does U+034F COMBINING GRAPHEME JOINER join graphemes?
A. No. Despite its name, the combining grapheme joiner neither joins graphemes together in the way punctuation might, nor does it create new graphemes by combinations of other characters. Especially, it cannot be used to construct grapheme clusters out of arbitrary character sequences, or extend the scope of subsequent combining characters. It has no impact on line breaking, except that as for other combining marks, it should be kept with its base when breaking a line.
