Microsoft Dynamics NAV: MenuSuite Department Menu Bitmaps
In Microsoft Dynamics NAV 2013 you can modify or create a MenuSuite. One of the menu properties that you define when setting a MenuSuite is the Bitmap property. This identifies which of the internal resource images to display as the image for your MenuSuite.
The valid range of numbers is 0 through 15. Here is an image that displays the bitmaps and their values: