Ʃ

êƩ (uppercase: Ʃ, lowercase: ʃ) is the fifteenth letter in Orish. Its sound is /ʃ/, unvoiced postalveolar fricative.

Pronunciation
To pronounce the sound of the letter Ʃ, raise the blade of your tongue to your hard palate and block the air just a little bit so that when you release air through it it will create a friction sound. Not less important, keep your vocal chords loose and don't vibrate them.

It's also recommended to round the lips when pronouncing this sound.