Sorry if this is maybe an obvious answer. I'm just scratching my head. I just noticed it after the latest update.

Wonderful day!

I've never used the wonderful client yet, but was curious too, and checked the source code.
Evidently, it should be "person's score":

// ...
val personScore = personTracker.getPersonScore(targetPersonId = personId)
if (personScore != 0) {
  append(" [")
  val s = length
  append(personScore.toString())
  val e = length
  append("]")
// ...

Source: LemmyHeaderHelper.kt

If you look at the "WIP 1.82" post, you can find something related to user scores. I'm not entirely sure how it's calculated, but I think the intent is to show how many up- and downvotes a user gets.

Seems to be the upvotes - downvotes that you've given a person across their posts.

More specifically, how many they get from you specifically, not their overall "Reddit Karma"

Helps identify people you regularly agree/disagree with.

Six

I was going to point to the release notes but then I realized I didn't released them yet 😆. Yeah it's what everyone else said. It's the number of times you upvoted a post/comment by that user subtract the times you downvoted them. It's local to your device though so if you vote on web, it will not be updated on mobile.

You can turn it off in Settings > Misc > Show per-user scores.

I was still trying to figure out how it worked, because the calculations seemed weird to me. This is very helpful, thanks.

Cool idea! thanks.

Credit to the dev of Voyager since I think that's where this idea came from.

Ooh!! I'm on v1.81.6 (335) and not seeing this setting. Is there a chance it's only available for some android devices and not others?

The release isn't "official" yet. It's currently only available on github. It will be released more widely soon but I am still working on some things that I want to go along with the release.

Thank you!