visVega currently have the `` icon. I think that was just the first icon we came across when needing an icon. Vega itself has no icon, so we kind of are free to do whatever we want there. Maybe we can think about a better icon then the existing one.
My short description of what Vega is: it's own flexible grammar that you can write to generate very flexible charts (not linked to any charts existing in Kibana yet).