That looks like your browser is somehow misinterpreting the character set of the page. What you're seeing appears to be something like code page 437 (https://en.wikipedia.org/wiki/Code_page_437) rather than unicode.

What browser/os are you using? Is it possible you're going through a proxy that is altering the HTTP headers?

The spade symbol[0] is codepoint 9824, the acknowledge control picture[1] (␆) is codepoint 9222. They shouldn't be using the same glyph.

[0] http://www.fileformat.info/info/unicode/char/2660/index.htm [1] http://www.fileformat.info/info/unicode/char/2406/index.htm