Ok, so on one side we have the zombie code and possible changes in the brain. Swing it back the other way to the most mundane explanation. The symbols may be mason marks or something. A fraternal organization that Datu and others might have been part of. Nothing nefarious. Just a plain old society like mason, lyons or Shriners. No illuminati, new world order conspiracy, just a club.

Or, something darker. Kalani, Datu, Durai, etc. all these translate to chief or leader. Hell, even Saul is a hebrew king and Cohen, the guy who tattooed Ink, is hebrew for priest, Make it more of an old school family type connection. Almost everybody is in on the conspiracy, and that is what Michael is writing about.

Switching gears. Didn't Saul say Victor was a broker in this episode? Did he tell Michael he was an insurance salesman? Similar, but not the same. A chink in a background lie?