In this example the Shuffle mode and the Tempo (formerly "Speed") are set to the default / standard value, so nothing is indicated on the "Options" button (no "S" or "T").
As the repeat mode is set on "Repeat: list", "R" indicates a non-standard setting. "P" indicates that the "Pause after each song" is active.
Where there is not enough space to show these letters, a dice will just indicate how many options are not set to the standard value: