*1

Holds the result of the last REPL expression.

(+ 1 2 3 4)
;;=> 10

*1
;;=> 10

(inc *1)
;;=> 11

Note that a standalone evaluation of *1, *2, *3, or *e is not a part of remembered history:

:first
;;=> :first

:second
;;=> :second

:third
;;=> :third

*3
;;=> :first

*2
;;=> :second

*1
;;=> :third