There are several synonyms for the term "green book", including travel guide, route planner, navigation tool, road atlas, and map. These terms all refer to resources that provide information about travel and navigation, particularly for drivers. The "green book" specifically was a guidebook for African American travelers during the era of segregation in the United States, providing information about safe places to stay, eat, and visit. While the original "green book" is no longer in circulation, its legacy lives on as a symbol of the struggle for civil rights and equality. Today, a variety of travel guides and navigation tools exist to help travelers plan their journeys safely and efficiently.