FullForm

FullForm[expr] prints as the full form of expr, with no special syntax.

Examples

See full form of expressions:

FullForm[a + b]
(* Plus[a, b] *)

FullForm[a/b]
(* Times[a, Power[b, -1]] *)

FullForm[{1, 2, 3}]
(* List[1, 2, 3] *)

Please visit the official Wolfram Language Reference for more details.