I didn't notice anyone talking about the cha.OS application yet, but I noticed a few things!

It looks kind of like an apple, but it also looks a lot like a butterfly - as in, the butterfly effect, which is related to chaos theory! The arrows could represent the forces at play, with the butterfly's wings flapping inward and the consequences cascading out into the world. (One of my followers also pointed out there are four inner arrows and two sets of three outer arrows - further hinting at a session with three nymphs and three satyrs.)

I also wonder if the butterfly effect alludes to Vriska, who has fairy wings and has now begun to make very subtle changes to each timeline she interacts with... did Deltritus change colour as a result of some subtle hint made to the planet's history when she arrived?

Also, an obvious one that it took me too long to realise - the app is called cha.OS because it's a near-simile for "Discord" LOL. if the symbol IS an apple and a butterfly simultaneously, it might even represent the mythical "Apple of Discord"