The term ‘5-0’ for police originated from the television show ‘Hawaii Five-O,’ which aired from 1968 to 1980. The show’s title referred to Hawaii being the 50th state of the United States. Over time, the term ‘5-0’ became a slang term for police, especially in urban areas. It is often used to alert others of police presence, particularly in contexts where law enforcement might be unwelcome. The term has since been popularized in various forms of media, including music and movies, further embedding it in popular culture.