What is meant by Al-Raqeem in Surat Al-Kahf?

The exegetes differed regarding the meaning of "Al-Raqim." Some said: It is the name of a village or a valley. And it was said: It is a book. And it was said: It is a stone tablet on which the story of the People of the Cave was inscribed and placed at the entrance of the cave. The most accurate of these opinions is that Al-Raqim is a tablet, or a stone, or something on which a writing was inscribed.