Six Degrees of Separation

idea that all people are six or fewer social connections away from each other. everyone can be connected by a “friend of a friend” statement aka six handshakes rule

See also - Small World Experiment by Stanley Milgram

Six Degrees of Bacon

Six degrees of Bacon is a trivia game based on the idea that any two actors can be linked through their film roles in six steps or less, using Kevin Bacon as an example