Image: Iravatham Mahadevan
Image: Iravatham Mahadevan

This is the adjective high with the addition of some horizontal lines, which represent terracing. Hence, it is an ideograph for an agricultural terrace.

Illustrative Text Reference:

Mohenjo-daro: Seal: M-101 a: Jagat Pati Joshi and Asko Parpola, 1987: Corpus of Indus Seals and Inscriptions: Volume 1: Page 38: Collections in India: Suomalainen Tiedeakatemia.

Image Credit:

Indus Script Sign Number 1022: List of Sign Variants: Iravatham Mahadevan, 1977: The Indus Script: Texts, Concordance and Tables: The Director General Archaeological Survey of India.