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thanks everyone, greatly appreciated :)

no, no, I'm talking about the particular structure "How/What do you call it?".
See, I remember asking this guy I knew "How do you call the thing you carry babies in" (I meant a pram, did not know...

So, what is the proper way of asking if you want to know the name of something?
Is it "How do you call it?" or "What do you call it?"?