This is a pictograph of mountains with smoke or flames coming out of the top, in other words, of erupting volcanoes. It is the adjective hot or fiery.
Illustrative Text Reference:
Mohenjo-daro: Seal: M-936 a: Sayid Ghulam Mustafa Shah and Asko Parpola, 1991: Corpus of Indus Seals and Inscriptions: Volume 2: Page 90: Collections in Pakistan: Suomalainen Tiedeakatemia
Image Credit:
Indus Script Sign Number 1054: List of Sign Variants: Iravatham Mahadevan, 1977: The Indus Script: Texts, Concordance and Tables: The Director General Archaeological Survey of India.