In this Indus symbol, four roads terminate at a perimeter. It means town square or city square.
Illustrative Text Reference:
Mohenjo-daro: Seal: M-184 a: Jagat Pati Joshi and Asko Parpola, 1987: Corpus of Indus Seals and Inscriptions: Volume 1: Page 52: Collections in India: Suomalainen Tiedeakatemia.
Image Credit:
Indus Script Sign Number 1227: List of Sign Variants: Iravatham Mahadevan, 1977: The Indus Script: Texts, Concordance and Tables: The Director General Archaeological Survey of India.