In this character, the solar symbol representing a single day is surrounded by the word round. A full round of days is a year. Hence, this indus sign is the singular noun year or the plural noun years.
Illustrative Text Reference:
Mohenjo-daro: Ivory Rod: M-2090 B: Asko Parpola, B. M. Pande, and Petteri Koskikallio, 2010: Corpus of Indus Seals and Inscriptions: Volume 3,1: Page 121: New material, untraced objects, and collections outside India and Pakistan: Suomalainen Tiedeakatemia.
Comment:
In inscription M-2090, the symbol is repeated and should be read as years and years.
Image Credit:
Year: Lynn Fawcett, 2019.