Monotanium
- Incredibly dense metallic alloy
- Commonly used in Hirogen starship hull construction (VOY: "Hunters", "Prey"; DS9 Novel: Demons of Air and Darkness)
- Incredibly resistant to weapons fire (VOY: "Prey")
- High density leads to natural scattering of most sensor and targeting beams (VOY: "Hunters")
- Presumably related to tritanium and/or titanium