Web pages display textual data by converting numeric character codes to physical characters based on the page encoding, which defines the range of available characters that can be properly displayed on the page.
The page encoding is set with one of the following three methods.
For greater visibility of the page encoding, Adobe recommends using the first method whenever possible. The third method may be unreliable for international sites and should be avoided whenever possible.
For additional information on encodings and character sets, refer to http://www.w3.org/International/tutorials/tutorial-char-enc/.