Ah the technical thingy: I had to Google, figure out what it was called. I thought just 'math instruments' but then I also though, this isn't just math. Rapidograph it is, sounds and looks really cool as a word.
Wait, it is the same word in Dutch and English, too? I just wrote the Serbian word in English... ahhahaah
Owww I have a second part which have to wait till February, since first I want to write a post about something else hahaha
Wait, what? 😂 More pens? 😃