The primitive is called call-with-current-continuation, or call/cc as a short alias

call/cc takes a parameter, which is a function of one parameter.

The parameter of the function is bound to the continuation, and the body of the function is E

(+ 5 (call/cc (lambda (e) (* 4 3)) ))

(cons 1 (cons 2 (cons 3 (call/cc (lambda (e) '()) ))))

(define x 5) (if (= 0 x) 'undefined (remainder (* (call/cc (lambda (e) (+ x 1)) ) (- x 1)) x))