The normal rotate tool can be used to rotate a polygon around it's normal. Be careful with multi-polygon selections because the result probably won't be what you expected.

Modes
The normal rotate tool can only be applied to raw polygon objects.

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  To perform a normal rotate, just select the polygons you want to rotate with the select tool. Now choose the normal rotate tool with the menu command "ToolsPolygonNormal Rotate" or a hotkey. You can now drag and drop your selected polygons around their normals within the 3D view. Release the mouse button to finish the operation.

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Properties

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