Jamarat are the 3 stone pillars, throwing rocks at it are a compulsory ritual of Hajj, which had been done by Prophet Ibrahim (AS). These pillars are the locations where satan stopped Prophet Ibrahim (AS) from sacrificing his son Ismail (AS). To stop satan, Ibrahim (AS) pelted stones at satan. Three pillars are following
1. Jamarat al Wusta
2. Jamarat al Aqaba
3. Jamarat al Ula