What does ^ mean in world championship studies?

Some matches are annotated with ^ here: lichess.org/page/world-championships

What does it indicate? I can't figure it out, I don't know if I'm missing a footnote or something (I'm viewing on mobile), or if I'm just missing something obvious...

Thanks a lot @b4c4d2 , I bet that's it

Yes, that's right - it's now clarified on the page :)