Most likely it refers with the numerical order of the choise all of the choises are called supremacy but have different numbers so the game can remenber and know with one you selected, simplified is simply the number of the choice selected like in a multi answer test that says select 1, 2, 3 or 4.
sorry if this is a extremely obsolete reply for the question if you already know this simply wanted to give and opinion trying to clear the confusion