This is a pictograph of a crossroads. It is an ideograph for the adverb across.
Illustrative Text References:
Mohenjo-daro: Seal: M-38 a: Jagat Pati Joshi and Asko Parpola, 1987: Corpus of Indus Seals and Inscriptions: Volume 1: Page 20: Collections in India: Suomalainen Tiedeakatemia.
Mohenjo-daro: Seal: M-682 a: Sayid Ghulam Mustafa Shah and Asko Parpola, 1991: Corpus of Indus Seals and Inscriptions: Volume 2: Page 36: Collections in Pakistan: Suomalainen Tiedeakatemia.
Image Credit:
Indus Script Sign Number 1370: List of Sign Variants: Iravatham Mahadevan, 1977: The Indus Script: Texts, Concordance and Tables: The Director General Archaeological Survey of India.