Barbary Coast was originally named after the Barbary pirates who operated in the area during the 17th and 18th centuries. Today, it typically refers to the red-light district and gambling dens that existed in San Francisco during the mid-1800s. There are several different synonyms that can be used to describe this area, including the Tenderloin, the Red-Light District, and the Five Points. Other related phrases may include vice district or pleasure district. Despite its notorious reputation, the Barbary Coast was a significant part of San Francisco's history, contributing to its development and culture in various ways.