Sand
If you grind a stone down to more than just a few pieces, it will become sand. Stones that get broken up enough will become sand, and you pick up a few grains in your hand.
Feel these few grains of sand between your fingertips. Imagine the stones that they originally came from. Nature is crazy.
さ, しゃ
すな
None
What’s in your hand? A few grains of sand (さ)! Sand, sand, sand!
Just remember that stones become sand and if you remember that this kanji means sand you’ll remember how to pronounce it as well.