Kohi script is an undeciphered writing system used in Gandhara (Wikipedia page , in what is now Afghanistan and Pakistan) from the first to the eighth century AD.
This writing system bears some resemblance to both Brahmi script and Kharosthi script.
Kohi script from Gandhara, Discovery of Another Ancient Indian Writing System, by M. Nasim Khan, Gandharan Studies, vol. 1, pages 89–101
The Wikipedia page is