"Flat-hats" refer to police officers in some areas of the United States. However, there are many synonyms for this term that are commonly used across the country. Some of the most popular alternatives include "cops," "law enforcement," "the force," "police force," "police officers," "police department," and "the blue." Other more regional expressions include "the fuzz," "the heat," "the boys in blue," "the badge," and "the constabulary." All of these synonyms refer to those who are sworn to protect and serve their communities, and who work tirelessly to keep our streets safe.