What is the word for a third book in a series?

I'm writing a book online and I've already written two books prior to that (given they weren't published by real people, but it's an online platform and it's fun). Anyway, does anyone know the word for a third book in a series? I have a couple ideas but I'm not entirely sure. Can anyone... show more I'm writing a book online and I've already written two books prior to that (given they weren't published by real people, but it's an online platform and it's fun).

Anyway, does anyone know the word for a third book in a series? I have a couple ideas but I'm not entirely sure. Can anyone help me out?
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