The Indus Dictionary Project
The basic container sign may be 18,000 years old¹. This basic shape is modified within the Indus script to give many different words.
For image credits, please see below.
Indus Script Signs with Numbers: Sign List of the Indus Script and List of Sign Variants: 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.
1. A drawing at the Grotte de Bayol, Collias incorporates the container symbol: The Cave Script Translation Project: Lynn Fawcett, 2013: http://www.cavescript.org/research/work/manual-labour/.