car
(car list)
The car function returns the first element of a list.
If the list is an empty list, the function returns nil.
: (setq lst1 '((a b c)(d e f g)))
((A B C) (D E F G))
: (car lst1)
(A B C)
: (setq lst2 '(a b c d e f g))
(A B C D E F G)
: (car lst2)
A