I like the general term "Web feed" as an umbrella term, I found about that on this article https://lighthouseapp.io/blog/what-are-web-feeds

Also that blog has some other good related articles:

- What is RSS: https://lighthouseapp.io/blog/what-is-rss

- What is Atom: https://lighthouseapp.io/blog/what-is-atom

- What is JSON feed: https://lighthouseapp.io/blog/what-is-json-feed

- What are feed readers: https://lighthouseapp.io/blog/what-are-feed-readers

- What is OPML: https://lighthouseapp.io/blog/what-is-opml