Mathematica uses a number of special characters for displaying mathematical symbols and others. Some of these are mapped to characters in the Unicode character set, and can therefore be translated into Unicode, suitable for displaying outside Mathematica. Others, however, are in the Unicode Private area, and are displayed correctly only using Mathematica fonts.
This web page translates the special characters in the form "\[Name]" to the equivalent Unicode character. (The mapping is defined in the Mathematica file "../FrontEnd/TextResources/UnicodeCharacters.tr".
Paste your code with \[Name] characters in the top box, and click Convert.