******** Calling cards are some sort of signatures outlaws leave behind in the crime-scene in order to trademark the mess they create and to claim responsibility over it or to frame others and cook the evidence. The Red Dragon amulet. calling cards came in form of a marked coin in the game "HITMAN CODENAME 47". Agent 47 would stash it inside a victim's body to frame Lee Hong into setting up the latter's death. Calling cards do not necessarily have to come in form of cards. It can be an item used to commit the crime or a modus operandi like posing the dead body in a certain posture or shooting their victims with surgical precision in order for the gunshot wounds to be aligned in a certain way. A common technique is to engrave a mark over a bullet's casing as depicted in the movie "THE REPLACEMENT KILLERS" Calling card holders might also leave a trail of evidence behind to challenge their rivals, to boast about commiting their crimes or to play mind games. in the movie "HARDBOILED", calling cards came in form of an origami crane. In fiction, vigilantes and good samaritans often make use of calling cards to mark their presence and demoralize villains. "BATARANG" for instance.