what is the output encoding you're using, for which this char does not exist?
Unicode Character 'PRIVATE USE TWO' (U+0092) should be available, since it's avaiable in every ISO-8859 encodings
I only find Windows CP1252 where it is not available.
But since maven-site-plugin's default encoding was ISO-8859-1 before 2.0 and is UTF-8 since 2.0 (see Reporting Encoding Configuration), this should be a problem only if you explicitely configured maven-site-plugin tu use CP1252. Or perhaps the font used does not have this char.
proposed Unicode Character 'ACUTE ACCENT' (U+00B4) does not have this problem since it is both in ISO-8859 and in CP1252.
This could be a workaround: thanks for the proposal Rémy.
But in fact it would be a workaround of the workaround, since the real problem is [quote handling|MNG-2855].
I'm actually working to release maven-reporting-impl 22.214.171.124 to fix quote handling, then I'll integrate it in MPIR. Stay tuned...