Charset for foreign languages

I'm currently doing some HTML that with urdu, farsi and chinese simplified characters. I'm having problems finding good resources online on what charset to use:

<meta http-equiv="Content-Type" content="text/html; charset=???" />

Any suggestions?

From stackoverflow

• UTF-8 can encode any character in any language in the Unicode standard, is ASCII-compatible and is well-supported these days. There's little reason not to use it for everything.

• UTF-8

• I suggest using UTF-8, that can encode any Unicode character.

  But apart from declaring the encoding in the document itself, it’s more important that your code is actually encoded in UTF-8. So get yourself a editor that can handle this encoding properly and declare the encoding in the HTTP header as it has a higher priority.