Rereading Oathbringer and when I got to the letter about the Calligrapher's Guild in Ch. 53, something stood out to me:
I've always wondered at the structure of the names of the Unmade, many of them being hyphenated. Well, there are 4 one-part names, 4 two-part names, and 1 three-part name (Ba-Ado-Mishram). The structure of the names seem to line up very well with the structure of glyph writing. So perhaps each part of a hyphenated Unmade name corresponds to a glyph.
There is also this quote:
So, the letter is suggesting that glyphs were in use by the Dawnsingers. The Unmade are described as "ancient" and were likely named by the Dawnsingers (although it is possible they were "unmade" at a later time). If the names and the specific glyphs in them are that old, they may be related to terms used on other Cosmere worlds. In particular, others have pointed out the similarity between "Ado" and "Adoda", which Dalinar explains means "light". If "Ba-Ado-Mishram" means something about "light", it would fit well with BAM's ability to use Light, for example, granting forms of power using Voidlight.
So what would this mean? It might give us some hints as to the nature of the Unmade, and we might eventually get some glyph-based artwork for the names of the Unmade, similar to the Radiant orders.