SwiftUI Tutorial Question

In the ScoreKeeper tutorial there's the following code:

				ForEach($players) { $player in
					GridRow {
						TextField("Name", text: $player.name)
						Text("\(player.score)")
						Stepper("\(player.score)", value: $player.score)
							.labelsHidden()
					}
				}

Can someone please explain why the 2 instances of "player.score" are not preceded by "$". Thanks!