The Oriya script developed from the Kalinga script, one of the many descendents of the Brahmi script of ancient India. The earliest known inscription in the Oriya language, in the Kalinga script, dates from 1051.
The curved appearance of the Oriya script is a result of the practice of writing on palm leaves, which have a tendency to tear if you use too many straight lines.
What every Indian should Know about state of Odisha – by Ananya