trophy

1. (criminology, by extension) An object taken by a serial killer or rapist as a memento of the crime.broadly

2. (historical, Ancient Rome) A tropæum.Ancient-Romehistorical

3. (art, architecture) A display of weaponry and other militaria, often captured from a defeated enemy, as an ornament designed for the purpose of triumphalist display by a victor or as a show of military prowess by a monarch.Examples: "The souvenirs which many killers retain of their victims are often described as trophies, and Norman Bates's taxidermic interests derived from the real-life Ed Gein."; "A trophy from this murder would have been of great importance."; "The offender is also likely to mentally relive his killings, often with the help of souvenirs or trophies, such as a bracelet or a body part taken from the victim."