vector - a vector of type (vector t *).
The vector is initialized to contain the objects.
(arrayp (setq v (vector 1 2 'sirens))) true (vectorp v) true (simple-vector-p v) true (length v) 3
(vector a1 a2 ... an) ==(make-array (list n) :element-type t :initial-contents (list a1 a2 ... an))