The Power Coins are the power sources of the Power Rangers.
The Zeo Crystal is a powerful crystal that hold within it the source of all life in the universe. Zordon brought it with him to Earth during the Cenozoic Era and lost it during his altercation with Rita. It is later revealed that the Zeo Crystal was located under the Krispy Kreme in present day Angel Grove.
The Power Sword is the personal weapon of the Red Ranger.