Unity Editor Built-in Icons

Unity version 6000.0.7f1

Load icons using EditorGUIUtility.IconContent(<ICON NAME>);

File ID

You can change script icon by file id

1. Open meta file (ex. *.cs.meta) in Text Editor
2. Modify the line icon: {instanceID: 0} to icon: {fileID: <FILE ID>, guid: 0000000000000000d000000000000000, type: 0}
3. Save and focus Unity Editor

All icons are clickable, you will be forwarded to description file.

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Original script author @halak