Here's a thing I've been meaning to do for ages.
There's always been speculation of what that mark on the barnacles, and now in the middle of the Thargoid markings, actually
is.
One theory is that it's a representation of a large-scale stellar structure that's important to the Thargoids, and several have been suggested. The two I hear most are Barnard's loop and the Large Magellanic Cloud.
I'm exploring around the edges of the Col70 sector (one possible origin point for the Thargoids, based on the events of Premonition and the triangulated location of the Probe signals, plus it's all permit locked which makes it seem more suspicious!).
So I took pics of both of these structures from that area, colour enhanced them, made them roughly the same scale, and altered the barnacle logo to have a similar appearance so it's easier to compare.
https://i.imgur.com/uBiE5h9.jpg
If the icon on the barnacles resembles either of these two, it's clearly the Large Magellanic Cloud more than Barnard's loop, those odd gaps in it sort-of resemble the LMC's structures. Though it's not a great match for either really.
Just thought I'd add this into this discussion since it might have a bearing on the meaning of that central logo.
Personally I'm feeling that the resemblance is a coincidence, but if it did turn out to be the LMC I wouldn't be stunned either because it's sort-of like it.