I would suggest that a slightly modified version of @GoHokies suggestion array layout or even a more precise, but a bit wordish array memory layout should suffice and be unambiguous.
In my opinion, this term is the clearest one, describing what row-major and column-major (and possibly some other variants) is.
Google search (Apr 7, 2018, google.ca):
- "array memory layout" - 2080 results with 100% of all first 10 results and images being to the topic
- "array layout" - 67500 results with only 3/10 directed at different areas of science (say, "array layout methodology for VLSI circuits"). So I would say it is safe to use
- "memory layout" results in a much larger #hits, but only 1/10 is relevant for the topic of the discussion
- "storage order" results in more than 100000 hits; however, a lot of them lead to a different (slightly or completely) areas.
- This uses a term "data layout" to generalize, but talks particularly about the ways arrays are stored in memory.
- This particularly discusses the "array layouts".
Though I doubt that any computational scientist or an average programmer would be confused by a term storage order, that is used wider.