This is the verb to trade with the addition of tracks oriented from the east to the west. It is an ideograph for the flow of traffic along the east west trade route. The meaning is therefore, east west trade route.
Illustrative Text Reference:
Mohenjo-daro: Incised Copper Tablet: M-537 A: Jagat Pati Joshi and Asko Parpola, 1987: Corpus of Indus Seals and Inscriptions: Volume 1: Page 135: Collections in India: Suomalainen Tiedeakatemia.
Image Credit:
Indus Script Sign Number 407: Sign List of the Indus Script: Iravatham Mahadevan, 1977: The Indus Script: Texts, Concordance and Tables: The Director General Archaeological Survey of India.