#Unity note : Platform dependent compilation

• consist preprocessor directives, let scripts partitioned, compile and execute a section of code exclusively for one of the supported platforms
• from the defined symbol we can get to know

1. UNITY_EDITOR
2. UNITY_EDITOR_WIN
3. UNITY_EDITOR_OSX
4. UNITY_STANDALONE_OSX
5. UNITY_IPHONE
6. UNITY_ANDROID
7. UNITY_2_6 //unity engine version
   
   and so forth.
   
   complete information on unity help manual

http://docs.unity3d.com/Manual/PlatformDependentCompilation.html