The Indus Dictionary Project
This symbol is a combination of the noun dead end, and a rope made from plant fibres. Hence it is an ideograph for the verb to move combined with the noun obstruction.
Mohenjo-daro: Seal: M-57 a: Jagat Pati Joshi and Asko Parpola, 1987: Corpus of Indus Seals and Inscriptions: Volume 1: Page 26: Collections in India: Suomalainen Tiedeakatemia.
I have based this symbol on Mahadevan's drawing of sign number 1100.
Move Obstruction: Lynn Fawcett, 2018.