Syntax highlighting on GitHub's Wiki: Specifying the programming language

GitHub uses something known as the "GitHub Flavored Markdown" for messages, issues and comments. My questions are:

• Does GitHub also use this syntax for their Wiki?

• From what I understand one can specify the programming language for syntax highlighting using the following syntax:

  ```ruby  
  require 'redcarpet'  
  markdown = Redcarpet.new("Hello World!")  
  puts markdown.to_html  
  ```
  

  Where one can specify the programming language after the ``` string (e.g. ```ruby)

  My question is: How do I look up the specifier for a programming language? (e.g. C does not seem to work for the C programming language)