That one made me literally laugh.
You're right about the item name. Many of the Bosch tools are sold as some kind of name, that you can pronounce, rather than a list of numbers/letters. Those numbers probably mean something (as far as a descriptive code) but you would have to be familiar with the lingo.
Sadly, many things are "dumbed down" (I wanted to say "for Americans", but that is probably too harsh, maybe just a more modern thing?)(In the western world anyway)
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It's pretty much the same as with Festool. In this case GBH = Gewerbliche BorhHammer. The 5 refers to it's weight class (in kg) (despite it being 6.8 kg, but that is pretty much with all "5 kg class" machines). The 40 refers to supposed maximum drill bit diameter (in mm). Then my guess would be the D is the grip shape, the C is the 'constant rpm' elektronics and the E is for adjustable speed. But it's not done consequently with all tools..
No names for Bosch tools here. That's mainly an American / Australian thing for them. I like the German naming better. All the mitre saws have their blade diameter in the name for example.
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