This is a combination of the symbol for the verb to deliver and a pictograph of some flames. It is an ideograph for the noun torchbearer.
Illustrative Text Reference:
Chanhu-daro: Seal: C-21 a: Jagat Pati Joshi and Asko Parpola, 1987: Corpus of Indus Seals and Inscriptions: Volume 1: Page 332: Collections in India: Suomalainen Tiedeakatemia.
Please note the presence of a central flame in this symbol. A torch would have had a central flame, whereas the ideograph for lamps does not portray a central flame.
Indus Script Sign Number 2929: Sign List of the Indus Script and List of Sign Variants: Iravatham Mahadevan, 1977: The Indus Script: Texts, Concordance and Tables: The Director General
Archaeological Survey of India.