The term "Cosa Nostra" is typically used to refer to the infamous Italian-American mafia. However, there are a few different phrases and synonyms that can be used to describe this organized crime group. One common phrase is "La Cosa nostra," which is actually the correct Italian way to refer to the mafia. Another synonym for the mafia is "the Mob," which is a more generic term that can refer to any organized crime group. Some people also use the term "the Syndicate" to refer to the mafia. Ultimately, while there are several ways to refer to the mafia, the term "Cosa Nostra" remains the most well-known and widely recognized.