Answer:
The dreidel has 4 sides with 4 Hebrew letters. In Israel, the letters are Nun, Gimmel, Hey, and Peh. This stands for the Hebrew "Nes Gadol Hayah Poh", translated as "a great miracle happened here". On dreidel's outside of Israel the Peh is replaced with a Shin changing it to "Nes Gadol Hayah Sham" or "a great miracle happened there".