This is a pictograph of vertical shoring. The horizontal bar is designed to prevent lateral movement of the vertical props.
Illustrative Text Reference:
Mohenjo-daro: Seal: M-948 a: Sayid Ghulam Mustafa Shah and Asko Parpola, 1991: Corpus of Indus Seals and Inscriptions: Volume 2: Page 92: Collections in Pakistan: Suomalainen Tiedeakatemia.
Comment:
A sealing made with M-948 may have been attached to a shipment of shoring timbers. Vertical shoring could have been used on some of the pack trails. Maintenance of the pack trails would have been an important activity.
Image Credit:
Indus Script Sign Number 2395: List of Sign Variants: Iravatham Mahadevan, 1977: The Indus Script: Texts, Concordance and Tables: The Director General Archaeological Survey of India.