A small square cartoon picture to represent yourself. You get one chosen for you if you don’t pick one. You only see avatars in the New New U.I..
In subreddit r/RedditForGrownups
In a post titled:
Proposed: redditors who make or use avatars that are dark-themed (especially black hoodie/sunglasses ones) post more disruptive/angry/trolling comments more often. Are others seeing this too?