"Huff-duffs" is a term that may not be well-known to many people. It refers to radio direction-finding equipment used by the military to locate and track ships and aircraft. Some possible synonyms for this term could be radio direction-finders, signal locators, or tracking devices. Other related terms could include radar, sonar, or GPS. These types of technologies are crucial for many different applications, from navigation to military surveillance. While the term "huff-duffs" may not be widely recognized, the technologies it refers to play an important role in modern communication and security systems.