html: © doesn't show

Put the copyright symbol in a <span> tag and in your css use a font that works.

<span class="copyright">&copy;</span>2007 Syom Industries

CSS:

.copyright {
    font-family: Arial,
         "Helvetica Neue",
         Helvetica,
         sans-serif;
}

Most likely — because the font you are using has a broken copyright character in it.

Without a test case it is hard to make a guess beyond that.

Adding a   before the © works for me as well, even with the Helvetica Neue font.