Even if we do not know what some of them stand for, here are all the icons that were datamined from Build 34081 of the Alpha of World of Warcraft: Shadowlands. It seems that they are linked to Revendreth for the most part, but also to covenants skills and one of the instances of the expansion.
Layout, bosses, and strats — everything you need to know about the Necrotic Wake from Shadowlands is in this article.
