The banner on the left is hanging in the sanctuary on the top right, which is located on the map in the area circled red.
This is the banner of Tanha Brah, who's name means "bottomless desire god". These ideograms/pictograms are unique to Titans. They have a specific purpose, to declare to the world, as a matter of pride, the styles of suffering a Titan has endured in battle. Some symbols are common to all Titans, and some are used by particular groups or individuals, but all Titan ideograms share one source, and are variations or abstractions of one ancient image. That image is of a six armed Titan hanging upside-down by his/her feet, from a star that is described as being "...remote from its own principle". All Titan ideograms are variations of this ancient root image, that is found daubed in red ocher on stone cliffs, and carved into ancient temples throughout Brahma. The meaning of this symbol, and those words, are one of the central mysteries of Brahma Vihara, and its origins.