One of the bullet points is "Abstract data types (with `Option` and `Result` predefined)." I wonder if they mean "Algebraic data type", since I have seen Option

One of the bullet points is "Abstract data types (with `Option` and `Result` predefined)." I wonder if they mean "Algebraic data type", since I have seen Option/Result before as an example of those, and they're both commonly abbreviated ADTs. Or maybe they're trying to get at a concept I'm missing here?