In my opinion, there are just too many ways to climb on a single rope to leave out the moving or stationary part. If the definitions and acronyms are important at all, they should be able to completely describe a system and how it is being used. It's a bit late since the terms static and dynamic are already applied to rope characteristics, though it should be 'low elongation' and 'high elongation' (maybe even 'medium elongation', too). This would leave static and dynamic to be used more appropriately when describing configuration. The terms 'moving' and 'not-moving' are especially poor compared to other options.