I've heard it referred to as the "bear killer", because bears allegedly end in October.
October '87's murderous plunge ended exactly one week later, because at that time trades used to settle in 5 instead of the present 3 days. Came settlement day, the market made what proved to be its final bottom, at a point slightly higher than the price it hit on crash day.
Basically, they shot the traders who were too far gone to save, buried the bodies, and proceeded to ramp it up from there, never looking back.