appelle-t-on

is ... called

→ appeler
phrase Rare #42,302
is ... called Used in the question pattern « Comment appelle-t-on… ? », meaning “What is … called?” The inversion « appelle-t-on » is more formal than « on appelle » or « on appelle comment ».
FR: Comment appelle-t-on cet animal en anglais ?
EN: What is this animal called in English?

Comment appelle-t-on ça?

What do you call that?

Comment vous appelle-t-on à la maison?

What do they call you at home?

Comment t'appelle-t-on?

What is your name?

Comment vous appelle-t-on?

What is your name?

Comment appelle-t-on cela?

What do you call that?