The Indus Dictionary Project
This composite Indus sign is comprised of three elements. There is a point of light at each of the cardinal points, which gives us everywhere or all areas. Then, there is the symbol for a cart load, and the symbol for a road or route. The translation might be something like 'Cart loads: routes serving all areas'.
Mohenjo-daro: Seal: M-137 a: Jagat Pati Joshi and Asko Parpola, 1987: Corpus of Indus Seals and Inscriptions: Volume 1: Page 44: Collections in India: Suomalainen Tiedeakatemia.
There is only one extant example of this Indus sign.
There are no other symbols on seal number M-137. Perhaps the seal was used in a similar way to a business card.
Indus Script Sign Number 392: Sign List of the Indus Script: Iravatham Mahadevan, 1977: The Indus Script: Texts, Concordance and Tables: The Director General Archaeological Survey of India.