The double-headed coin belonged to the criminal "Boss" Moroni and it was found in a crime scene with his fingerprints on it. Harvey Kent used the coin as evidence in the trial against Moroni. Unfortunately, Kent's face was scarred in half by acid thrown at him by Moroni. Losing his sanity, Kent became the criminal Two-Face and decided to leave his decisions upon fate. For this, he scarred one side of the double-headed coin to use it as the instrument that would help him decide between good and evil.
Flipping the coin dictates Two-Face when making any significant life decisions. If the coin lands on the scarred side, Two-Face will pursue acts of evil. If the coin lands on the unmarked side, he is compelled to commit acts of good. At one point Two-Face was so dependent on the coin for any of his criminal acts that he could be easily defeated by taking the coin away from him or preventing him from seeing the result of the flip.
- In the movie Batman Forever and the episode Two-Face, Part II of Batman The Animated Series, Batman easily defeated Two-Face by throwing up multiple quarters and silver dollars while the villain was in the middle of flipping his coin. The former resulted in death of that universe's Two-Face.
- In the movie The Dark Knight, Dent was burned in a fire instead of hit with acid or scarred by Maroni. Following his updated origins, one side of the coin was scorched instead of scarred.