The dreidel or sevyvon is a four-sided top, and is a game traditionally played during the holiday of Hanukkah / Chanukah.
The connection to the game of dreidel goes back to the time of the Temple when the Jews were prohibited from studying Torah. They needed a way to hide their Torah learning and dreidel was often used as a decoy. When they saw others coming, the Jews would hide their Torah books and take out their dreidels, thus tricking them that they were just playing a simple harmless game.
Outside of Israel, it is common to say "Nes gadol hayah sham" - 'A great miracle happened there' - meaning that the great miracle took place there, in Jerusalem.