Sequence

Sequence[expr1, expr2, ...] represents a sequence of arguments to be spliced automatically into any function.

Examples

Splice arguments into a function:

f[Sequence[a, b, c]]
(* f[a, b, c] *)

Use in list construction:

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

Please visit the official Wolfram Language Reference for more details.