In this composite symbol, the verb to deliver or to meet is surrounded by four dots of emptiness, one at each of the cardinal points. A dot of emptiness signifies that something is not known.
Hence, Mahadevan's sign number 7025 is the adjective lost.
Illustrative Text Reference:
Lothal: Seal: L-48 a: Jagat Pati Joshi and Asko Parpola, 1987: Corpus of Indus Seals and Inscriptions: Volume 1: Page 249: Collections in India: Suomalainen Tiedeakatemia.
Indus Script Sign Number 7025: List of Sign Variants: Iravatham Mahadevan, 1977: The Indus Script: Texts, Concordance and Tables: The Director General Archaeological Survey of India.