Do not use the trademark entities ™, ©, or ® because the do not produce HTML output that works for all charsets. The HTML output produces by these entities are declared in the DTD and cannot be changed via the stylesheet.

Instead, use the trademark tag and its associates classes as follows:

<trademark>trademark symbol after me</trademark>
<trademark class="registered">registered trademark symbol after me</trademark>
<trademark class="copyright">copyright symbol after me</trademark>