This Will Be Your Sign

"Know that Har Sinai (Mount Sinai) testified that its rocks have the image of the Sne (burning bush). This is how Har Sinai received its name, from the Sne."
דע כי הר סיני העידו עליו כי האבנים הנמצאים בו יצוייר עליהם הסנה ולכן נקרא ההר ההוא סיני על שם הסנה (כדאיתא בפרקי דרבי אליעזר פרק מא'

In all the rocks of Har Sinai, you will find an amazing picture of the Sne. Even if you break the rock into 2 pieces, in each broken piece, you will find the picture of the Sne. Even if you break it into million of pieces, you will find on each piece an image of the Sne. Each tiny piece of the rock will be seen, and the size of the Sne depends on the size of the rock. But no matter what, the picture of the Sne will be complete, unbroken.

These rocks can be found in Jebel Musa, in Sinai, around the mountain.

The Gaon HaMekubal Rabbi Natan Shapira, zs'l, in his sefer, Megale Amukot:
When HaShem revealed to Moshe Rabenu in the Sne (bush of thorns), HKB'H said to Moshe Rabenu, zs'l, "This is the sign for you on the Sne (burning bush), when you will redeem Am Israel."