ACKs and NAKs are basic telecommunication transmission characters. To ACKowledge or to Not ACKnowledge. In other words, they’re opposites which when used together make the whole. They are like the Yin and the Yang, opposites that are interconnected, interdependent, and meaningless without the other. To be complete and effective, both must be present and work together. Man and woman, light and dark, high and low, earth and air, ack and nak, occupy and tea party, democrats and republicians.