None of the ones here look right: http://acronyms.thefreedictionary.com/NRN
I found it!!!!!!! http://www.dscr.dla.mil/rmf/policies/milstrip.pdf
It stand for:
National Geospatial-Intelligence Agency Reference Number (NRN)
The NRN is a variable length number (up to 15 characters) used to completely identify a map product. The NRN is used when ordering non-NSN assigned products and under certain conditions can be used in MILSTRIP/FEDSTRIP. The NRN consists of a product series (up to the first five character spaces) and Product Number (up to ten character spaces), which relates intelligence data about the item. The first five positions are the Series which is "X" filled for MILSTRIP, e.g., M745 L3546 becomes M745XL3546 when using MILSTRIP/FEDSTRIP. When ordering using a NRN, use Document Identifier Code "A0D" for CONUS or "A04" for OCONUS activities.
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