A proprietary, energy absorbing, end terminal owned by Lindsay.
From the manufacturer's website:
The MASH-compliant MAX-Tension TL-3 tangent end terminal with Sabertooth technology features the next level of impact performance in an ultra-slim design. The system has a tension-based design along with an energy-absorbing coupler that utilizes an innovative cutting-tooth technology. When impacted head-on, deceleration is controlled by friction in the tension cables and by cutting the downstream guardrail panels. When a side impact occurs, tension cables can help safely redirect a motorist away from the hazard. In addition, the MAX-Tension TL-3 terminal utilizes standard guardrail components for significant savings in inventory and maintenance costs. Nuisance impacts during snow removal and maintenance operations can also be minimized due to the narrow design of the MAX-Tension impact head.