square.fill

Image("font-awesome.square.fill")
    .font(.title)
    .fontWeight(.semibold)

Label("Square", image: "font-awesome.square.fill")

let configuration = UIImage.SymbolConfiguration(
    pointSize: 24, weight: .semibold, scale: .medium)
let image = UIImage(named: "font-awesome.square.fill", in: nil, with: configuration)

let configuration = NSImage.SymbolConfiguration(
    pointSize: 24, weight: .semibold, scale: .medium)
let image = NSImage(named: "font-awesome.square.fill")?
    .withSymbolConfiguration(configuration)