What is the Kursi?

Imām Ibn al-Jawzī (d. 597/1201) summarized the scholars' opinions in his book "Zād al-Masīr" as follows:

1. It is a 'seat' above the seventh heaven, beneath the Throne (ʿArsh). The Prophet (ﷺ) said: "The seven heavens compared to the Kursī are like a ring thrown in a vast open land." [ʿAṭāʾ from Ibn ʿAbbās]
2. The Kursī refers to the knowledge of Allah Most High. [Ibn Jubayr from Ibn ʿAbbās]
3. The Kursī is the Throne itself. [al-Ḥasan]