This is a pictograph of an adult person with two walking staffs. The two staffs are indicative of age and seniority. Hence, this Indus sign is the noun elder.
Illustrative Text Reference:
Harappa: Seal: H-517 a: Sayid Ghulam Mustafa Shah and Asko Parpola, 1991: Corpus of Indus Seals and Inscriptions: Volume 2: Page 287: Collections in Pakistan: Suomalainen Tiedeakatemia.
Image Credit:
Elder: Lynn Fawcett, 2019.