Construct

Construct[f, x] gives f[x]. Construct[f, x1, ..., xn] gives f[x1, ..., xn].

Examples

Apply a function dynamically:

Construct[Plus, 1, 2, 3]
(* 6 *)

Use with symbolic functions:

Construct[f, a, b]
(* f[a, b] *)

Useful for meta-programming:

Map[Construct[#, 2] &, {Sin, Cos, Tan}]
(* {Sin[2], Cos[2], Tan[2]} *)

Please visit the official Wolfram Language Reference for more details.