Police hold (arterial oobstruction, carotid sleeper)

The aggressor grips the front left and right sides of the throat of the victim between the upper and lower arm so that the crook of the elbow is placed in the middle of the throat. When the grip is tightened, pressure is exerted on both sides of the throat, compressing the arteries. The arteries could possibly be completely closed. The airways are not compressed.

The result, the victim is rapidly disabled and loss of consciousness is rapid, usually within 10 seconds.
Loss of consciousness is not as rapid if the grip is not fully effectively applied.