Why is it that we all use VDE ratings for high voltage insulated screwdrivers, but (as far as I'm aware/can think of) nothing else?!
I suppose DIN is similar: to most people it's just the rail. (Not to mention I wouldn't be surprised if the common one is just one of many DIN rail specifications or size variants.)
If you ever work on anything electrical in Germany, you see the acronym VDE everywhere on standards etc.