You need to use ISO-8859-1 / UTF-8 characters to accomplish inserting (in your case) a superscript 3.
List of HTML ISO-8859-1 Reference entities.
For example in your AndroidManifest.xml
<application
android:hardwareAccelerated="true"
android:icon="@drawable/ic_launcher"
android:label="Myapp³" <!--or reference it from @string -->
Or use the HTML entity ³
(hex) ³
(dec) somewhere in a String, like:
<string name="app_name">Myapp³</string>
Small compilation of Unicode reference tables
Unicode 6.2 Character Code Charts
- C1 Controls and Latin-1 Supplement (ranges 0080-00FF where superscript resides)
- General Punctuation
- CJK Symbols and Punctuation
- CJK Compatibility Forms
- Small Form Variants
- Halfwidth and Fullwidth Forms
(from wikipedia)