The "pipe of peace" is a traditional Native American custom of smoking a peace pipe as a sign of goodwill and friendship. While the term "pipe of peace" is commonly used, there are several synonyms that can be used interchangeably. Some of these synonyms include "calumet," which specifically refers to a long ceremonial pipe that was traditionally used by the indigenous people of North America. In addition, terms such as "sacred pipe," "covenant pipe," and "peace pipe" can all be used to describe this special type of pipe that has played an important role in Native American culture and tradition for centuries.