The Indus Dictionary Project
This is a pictograph of someone with their hand raised in greeting. It is the verb to greet.
Mohenjo-daro: Seal: M-403 a: Jagat Pati Joshi and Asko Parpola, 1987: Corpus of Indus Seals and Inscriptions: Volume 1: Page 97: Collections in India: Suomalainen Tiedeakatemia.
In inscription M-403, the symbol is drawn as if the greeter is stepping forward with his left leg.
This word is sometimes followed by the word male to give us the occupation greeter man. Greeters were people who met with incoming boats and caravans to offload their wares.
Indus Script Sign Number 18: Sign List of the Indus Script: Iravatham Mahadevan, 1977: The Indus Script: Texts, Concordance and Tables: The Director General Archaeological Survey of India.