Reverse

Reverse[expr] reverses the order of the elements in expr.

Examples

Reverse a list:

Reverse[{1, 2, 3, 4, 5}]
(* {5, 4, 3, 2, 1} *)

Reverse a string:

StringReverse["hello"]
(* "olleh" *)

Please visit the official Wolfram Language Reference for more details.