A door, as to the entrance of a room, house, or new opportunity. (We’ll see ourselves out 🚪🚶.) Depicted in brown, as made of wood, with a gold handle.
May represent literal doors and related concepts (e.g., rooms, houses) but often used figuratively (e.g., opening or closing metaphorical doors).
Google’s design features a peephole and Microsoft’s a step, as if a front door.