This ideograph is composed of a track, with an arrow in the distance. The arrow is pointing towards you. Hence, this symbol is the preposition from.
Illustrative Text Reference:
Mohenjo-daro: Seal: M-119 a: Jagat Pati Joshi and Asko Parpola, 1987: Corpus of Indus Seals and Inscriptions: Volume 1: Page 41: Collections in India: Suomalainen Tiedeakatemia.
Comment:
This is Mahadevan's sign number 1361, which I have redrawn to better reflect the original.
Image Credit:
Preposition From: Lynn Fawcett, 2017.