Shin/Sin

 

The Four-Headed Shin

The letter Shin appears engraved on both sides of the head tefillin. On the right side, the Shin has three heads, while on the left side it possesses four. If you look closely, it is possible to see an additional three-headed Shin formed from the spaces between the four heads. The three-headed Shin is the Shin of this world, while the four- headed Shin is the Shin of the World to Come.