Ni (Nippur) 9776 is a clay tablet that contains lines 322-327, 339-340 (column I, reverse), and 376-384 (column II, reverse side) of "Inanna's Descent to the Netherworld," a Sumerian afterlife myth in cuneiform script. The obverse side of the tablet is destroyed. Ni 9776 is currently located at the Istanbul Archaeology Museum (Istanbul, Turkey) and is likely not on display.
The artifact was first published in 1969 by Samuel N. Kramer, Cig Muazzez, and Hattice Kizilyay in Istanbul Arkeoloji Müzelerinde Bulunan Sumer Edebî Tablet ve Parcaları (Sumerian Literary Tablets and Fragments in the Archaeological Museum of Istanbul) as plate number 125 (commonly abbreviated as ISET 1 (1969) 183). William R. Sladek's 1974 translation of "Inanna's Descent" uses this artifact as source X (according to his own sigla). This translation contains transliterations and commentary as well.
The Ni 9776 artifact was discovered during various expeditions in modern-day Iraq to uncover artifacts related to the ancient Babylonians and Sumerians. Various scholars, like Samuel N. Kramer, contributed to volumes of publications related to this artifact. 1969 was the publication date for Sumerian Literary Tablets and Fragments in the Archaeological Museum of Istanbul, the first volume that contained this artifact.