Some of symbols or characters are not be able to show in web page directly. You have to use a special set of codes (escape characters) to show correctly in web page. Html special characters are listed in below table for reference. Please note that not all characters are supported by every browser. Some browsers may support the numeric reference without supporting the character entity reference.
Just a normal software developer who love to write code. Developing professional software since 1999. After working in the software industry for many years, I've started my own website to share knowledges and experiences.