Prejudikat
What A guiding ruling from the highest court (prejudikat) that shows how an unclear law should be interpreted and that governs similar future cases.
Who The highest courts, whose judges are public officials who, through their rulings, set the frame for how the law is read across the whole country.
How You rarely meet them directly, but they decide how your own case can be judged, and they are public and can be read and referred to.