Bizarrely, I was at +4 moments ago and now sit at -1
It's a measure of how closely you correlate with the typical HN reader and that itself changes over time.
I have made more friends just through HN than the 200 odd HN karma points I have.
Have learned infinitely more thanks to HN.
As a person who believes that gun, healthcare and education are unalienable rights, people have a very tough time agreeing with me on all things, and me with them!