Very good question, not very difficult to answer, but prompting reading on the subject. Thank you.
The word Extensible does the trick I guess. It is nice to have to answer a straightforward, no assumptions or second guessing needed QOD before the weekend starts. Imagine someone posting RAID is an acronym for: and including both Redundant Array of Inexpensive Disks and Redundant Array of Independent Disks as options. That would generate 10 pages worth of arguments would not it?