From what I see, Java lambdas are called “function literals” in Kotlin . There is a recent Reddit discussion about the Java and Kotlin syntax for them. In the discussion  it appeared to me, that the Kotlin syntax for them is better suited for builders and Groovy-style closures, and both of them are used for important features in some high-profile Kotlin projects on GitHub.
I wonder if we could find a suitable name for the Groovy-style closures or continuations. There are some paragraphs that describe them in , but no explicit name is given. Maybe we could find some good use-cases of them, and add examples to the Idioms chapter  in the Kotlin reference docs.