So I woke up this morning to scan through my Peakd Profile, and I noticed this number right on my profile.
I can't seem to find any publication or announcement by peakd, but upon doing a little research, I figured it out.
Apparently, 
KE stands for Krampus Coefficient and is calculated by summing up all the rewards you have ever earned (Author rewards + Curation rewards), and dividing it by your Staked hive.
Generally, a lower KE signifies that you have staked more. If your KE is less than 1, it means you've invested external money to stake hive. If your KE is equal to 1, it means you have staked every single thing you have earned to stake hive. And anything higher than that signifies how much hive you've sold relative to the amount you've earned.
It is hard to say what this means, but Azircon thought of it as a different type of reputation system, and I believe he's been using that as a criterion when curating for a while now. Now that it's publicly displayed on the profile, it could factor a lot more in some people's decision on whether to curate or not, both consciously and unconsciously. It would also affect some people's decisions on whether or not to withdraw their hive.
As for me though, it is pretty much business as usual, but it is fun just to check scores. Nice work from the ever innovative @Peakd team.
In the end, this is a decentralised space, and everyone is free to do what makes them happy with their money. Hope you've found this insightful
edit: In case you're interested in reading about Azircon's thought process concerning KE, here's two blogs of his 1, 2
