Comment by karmakaze

10x engineer: one that produces 10x the solutions, or creates 1/10th the problems, or a mix of the two--over a long enough time span to include second-order effects.

The weak version of the term is one that enables the team to produce 10x, or ..., which I personally don't go for, it's watering down a difference in abilities which acknowledging makes people uncomfortable. I would call them sqrt(10)-x engineers who do 3x and let the team do 3x.