Remove @ char - there is no line here.
[String]::Join("\u00A0", $arr)
Added after S. Mark's answer:
I will add, because S.Mark has already posted an answer that you can accept that here the lines begin with @ . Try google them. And - this is slightly different from C #. You do not run away with \ , but with the return stroke. So probably the line should be something like "` u00A0 ", but I'm not sure ...
Decision
After some freezing, I found Shay's answer, which is probably what you wanted.
[String]::Join([char]0x00A0, $arr)
or maybe
$arr -join [char]0x00A0
Shay answer how to avoid the Unicode character.
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