Built-in Mathematica Symbol

PasteButton

PasteButton[expr]
represents a button that pastes expr whenever it is pressed.

PasteButton[label, expr]
displays with label on the button.

expr is by default pasted at the current insertion point in your input notebook.

PasteButton evaluates its arguments in an ordinary way, so that expr is immediately evaluated.

If expr contains a selection placeholder, it will be replaced by your current selection when the paste is done.

Selection placeholders are represented by the character or \[SelectionPlaceholder].

Create a button that will paste its contents:

Supply a different label: