This is a pictograph of a wine vessel. The vessel has a handle and a spout, and sits on tripod feet. It was a ritual vessel used to pour a libation. Hence, it is an ideograph for the noun libation.
Illustrative Text Reference:
Mohenjo-daro: Seal: M-402 a: Jagat Pati Joshi and Asko Parpola, 1987: Corpus of Indus Seals and Inscriptions: Volume 1: Page 97: Collections in India: Suomalainen Tiedeakatemia.
Comment:
There is only one extant example of this Indus sign.
Inscription M-402 is interesting because it refers to a summer festival in honour of Ishtar.
Image Credit:
Tripod Wine Vessel: Lynn Fawcett, 2018.