My question was retitled:
What is this function called?
Originally my title was:
How is this function called?
I still think that my version was correct; I always state such questions this way. Which one is really correct?
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A literal translation of the German "Wie heißt das Buch?" is "How is the book called?" but an idiomatic English translation would be "What is the name of that book?" I mention this because your other answers have taken the cue from "called" to give you constructions with "called". When asking what something is "called" it's about a more general property. "What do you call the man who brings your mail?" The mailman. "What is the name of the man who brings your mail?" Bob.