A diagonal line that looks like a dice sitting of its 3 dotted face, especially because the Rubik's cube is exploded.
|R U R' U R' F R F' U2 R' F R F'|
A stylized Z standing on the front face (or back since it is symmetric).
|y L F' L' U' L U y' R d' L' y'|
A stylized S (or reverse Z) standing on the right face (or left since it is symmetric).
|R' F R U R' U' y L' d R|