What does ROD stand for?

Rib Office Database File

Remote Operated Door(s)

Ray of Doom

In Bloons TD 6, the Ray of Doom (abbreviated as RoD) is the Tier 5 upgrade of Path 1 for the Dartling Gunner. The Ray of Doom, like the Ray of Doom in BTD5, fires a continual beam of destruction. It is a far more powerful variant of Plasma Accelerator, and it compensates for the absence of a high-damage focus point by doing incredibly high damage with its laserbeam.