Pivotal act

A pivotal act is (putting down my guess here) something that allows a single entity (?) to take over the world? form a singleton? prevent others from taking over the world or forming a singleton or achieving AGI?

according to some views of AI takeoff, a pivotal act is an important part of the plan for preventing existential doom from AI.

Examples

• "Build self-replicating open-air nanosystems and use them (only) to melt all GPUs."