The Rune of Acererak

(minor) Spoilers for Tomb of Annihilation

In Tomb of Annihilation, there's a description of Acererak's staff: "This crooked staff is carved from bone and topped with the skull of a forgotten archmage whom Acererak destroyed long ago. Etched into the skull’s forehead is Acererak’s rune, which is known on many worlds as a sign of death...The bodiless life force of a dead archmage empowers the staff and is imprisoned within it. The rune carved into the staff’s skull protects Acererak from this spirit’s vengeance"

Sounds like a pretty significant symbol, huh? But doing some digging, I can't find any depiction or reference to it, in old modules or new.

There's just this illustration from the book cover:

Let's zoom in:

Kiiiinda looks like two triangles glued together?

Or, a bit like this: 

Ingwaz Rune

But with a line through it.

What are the IMPLICATIONS? Well, some research into some new-agey corners of the internet suggests the Ingwaz rune represents "...isolation or separation in order to create a space or place where the process of transformation into higher states of being can occur. Rune of gestation and internal growth." The 'gestation,' and Acererak-as-father, are very in line with Throne of Salt's 'Womb of Annhilation' interpretation of the module.

I also got the line "...sacrifice occurs when one form is called upon to die so that a newly evolved form may begin to grow... The failure of a magical operation is often caused by the lack of the operator ‘letting go’ of some past form of manifestation so that a newly desired form can be born." Which to me sounds very lich-y. Ingwaz can't normally be reversed, since it's symmetrical, but it can be struck through and ruined, like the aleph rune on the forehead of the golem.

This symbol of new beginnings and self-sacrifice becomes one of hanging on to the material world far too long, to the point that the world itself starts to warp around you, weary of your presence. It becomes the symbol of devouring others to continue your warped existence.

I also like that it kinda looks like two 'A's' glued together. Acererakarakarakarak