The Tiss'shar language was mainly formed of hisses, shrieks, and lisping vocalizations. It had a violent-looking calligraphy of curves and sharp lines.
Most Tiss'shar were fluent in both Tiss'shar and Basic, although they tended to be only literate in their own language.
The Rebel Alliance, wanting to track the Tiss'shar Kal-tan-shi, looked for an operative fluent in Yiss'shar. Unfortunately, most of them were droids, and Kal-tan-shi was a known droid-hater. They finally met their man in lieutenant Tole Warren.