SIN
[ׂש], Shin [ׁש].
The 21st letter in the Hebrew alphabet. This letter was used to represent two sounds, and in later periods, these were distinguished by the use of a diacritical mark. A dot placed over the left-hand “horn” [ׂש] gave the pronunciation “s,” while a dot placed over the right-hand “horn” [ׁש] gave the pronunciation “sh.”
In the Hebrew, each of the eight verses of Psalm 119:161-168 begins with this letter.