Hollow Red Circle on Reddit

What it signals here

upvote context

Used in comment threads to mark a reply as the correct answer when the OP hasn't awarded a medal yet.

community use

Appears in educational subreddits and quiz threads to denote correct responses.

subreddit meaning

In r/mildlyinfuriating or r/facepalm, used ironically to 'highlight' the obvious mistake in a post.

karma context

High-karma comments in trivia threads often use ⭕ to validate a specific answer above others.

See it elsewhere