I want to know the answer to the following question:
What was the warning signal called that warned the sender that there was impending overflow?
All the background I'm provided with is that "This technique became adopted by several early computer operating systems as a "handshaking" signal warning a sender to stop transmission because of impending overflow; it persists to this day in many systems as a manual output control technique.". Is that enough to answer the question?
Answer: yes