Standards that ignore human frailties will be corrupted by humans, and that's a good thing.
If you ever find yourself wanting to order the connectors or backshells, it might be useful to know it's actually DE-9.
DB15 is the only one I have issues with. The company I work with has one container with "DB15" connectors (DA-15), and one with "DB15HD" (DE-15)
Standards that ignore human frailties will be corrupted by humans, and that's a good thing.