The '***' variable is set to the result of the second to the last evaluated expression.
(setq a 'eenie) ; returns EENIE (setq b 'meenie) ; returns MEENIE (setq c 'beanie) ; returns BEANIE *** ; returns EENIE *** ; returns MEENIE *** ; returns BEANIE *** ; returns EENIE
Note: It is best not to use this variable in a program.
See the