โฮมเพจ › HTML-entities
Signs that are difficult to put directly in the HTML document can be inserted by using special sequences. For example, the copyright © sign can be inserted as © (169 is the decimal sign code) or as © (A9 is the hexadecimal code).
There are also html special characters for the many popular signs. For the copyright sign it's ©. You can find the special characters list below.