Mahadevan's sign numbers 287 and 299, the wrap and cover glyphs are used many times within the Indus script. Whenever something goes around something else, either literally or figuratively, the
Indus word will include one or both of these glyphs.
For image credits, please see below.
Indus Script Signs with Numbers: Sign List of the Indus Script: Iravatham Mahadevan, 1977: The Indus Script: Texts, Concordance and Tables: The Director General Archaeological Survey of India.
Indus Script Signs without Numbers: Lynn Fawcett, 2017 - 2020.