This is MY symbol, I made it from scratch (only submission so far that can with that quality). It is my avatar, along with a recurring symbol in my the in-universe aspect of my art, as the tribal symbol of Sartharina's former tribe, Mecan, and the symbol used by the Covenant to distinguish troops and equipment under her strategic control, at first a squad insignia, and eventually the logo of an entire fleet, once she achieves the rank of Supreme Fleet commander, which she does.
In-universe, it has a power in of itself, as it will shine and glow, along with correcting any flaws in the design, immediately upon application on anything legitimately affiliated with her or her tribe. However, the strength of the glow is dependent on the method of application and the spiritual signature or imprint of the marked entity. The power of the glow can be manipulated by psykers for very tangible effects. Sartharina's passive use of this energy adjusts the way she percieves the world. as well as protecting her from physical harm and damage control, making her incompatible with any known HUDs, and rendering helmets unnecessary.