What features of Indus script inscriptions led some scholars to suggest a Dravidian connection?

The suggestion that the Indus script may be connected to Dravidian languages primarily stems from computer-aided analyses of the inscriptions.12

In the late 1960s, research teams led by Yury Valentinovich Knorozov and Asko Parpola independently utilized computer technology to examine the order and frequency of the signs found on Indus civilization seals and tablets. These studies indicated that the underlying language was a suffixing and non-prefixing one, which led these scholars to propose a link to the Dravidian language family.12

Despite these findings, this hypothesis remains a subject of significant debate. Critics point out that this observation regarding the language's structure is the only basis for the Dravidian connection, and the theory has not resulted in a successful, widely accepted decipherment of the script. Other scholars have proposed alternative theories, including the possibility that the script represents an Indo-Aryan language or that it functioned as a pictographic system designed to communicate meaning to a multilingual population without relying on a specific grammatical structure.123