So, I was rereading the 1997 Fourth World series by Byrne and Simonson and the 2000 Orion series by Simonson, and I noticed the two author/writers seemed to alternated the design on Metron's forehead. He traditionally only has one circle on his forehead. But at times, his deisgn alternates and resembles the Brainiac symbol. I also noticed Metron's purpose/goals align with Brainiac's. The pursuit of ultimate knowledge.
I did find a small pattern when they changed the symbol up. In the instances where the tri-sigil appears, Metron appears to be doing something wicked. Such as freeing Darkseid from the Source Wall, taunt Orion about the death of Valkyra, or blackmailing Scott Free to use the Anti-Life equation to steal things from Darkseid for him. I could be reading too much into it though.
Brainiac and Metron. Like Superman and Orion, the two of them have a lot of parallel attributes. Exploring the nature of their characters would be something to think about.