hierarchical asynchronous coroutines and input output
Definition
HIO is an acronym which stands for 'Weightless hierarchical asynchronous coroutines and I/O in Python'.
It's Rich Flow Based Programming Hierarchical Structured Concurrency with Asynchronous IO. That mouthful of terms has been explained further on Github.
HIO builds on very early work on hierarchical structured concurrency with lifecycle contexts from ioflo, ioflo github, and ioflo manuals.