Stone prism of Esarhaddon at British Museum.
What is a stone prism? What is it used for?
check first, blog later, says I (to myself):
This small stone monument records the restoration of the walls and the temples of the city of Babylon by King Esarhaddon (reigned 680-669 BC). The cuneiform inscription is written in archaic characters to suggest antiquity and authenticity. The top of the stone is covered with symbols of the gods, and other elements designed to protect and authorize the message. (from the Brit Museum page:
http://www.britishmuseum.org/explore/highlights/highlight_objects/me/s/stone_prism_of_esarhaddon.aspx