This is a pictograph of a lotus plant with three flower buds growing from a common root. Therefore, Mahadevan's sign number 367 means lotus flowers.
Illustrative Text Reference:
Harappa: Seal: H-6 a: Jagat Pati Joshi and Asko Parpola, 1987: Corpus of Indus Seals and Inscriptions: Volume 1: Page 162: Collections in India: Suomalainen Tiedeakatemia.
Comment:
Inscription H-6 refers to plants that are growing in a lake.
Image Credit:
Indus Script Sign Number 367: Sign List of the Indus Script: Iravatham Mahadevan, 1977: The Indus Script: Texts, Concordance and Tables: The Director General Archaeological Survey of India.