If you are looking for a file to use in a game like Minecraft to manage player deaths, it likely refers to a "Corpse" plugin.
If you need a "piece" (visual asset) of a corpse jar for a design: ШЄШЩ…ЩЉЩ„ Corpse jar
There is no major mainstream game titled exactly "Corpse Jar," but the term appears in specific horror subcultures and literature: If you are looking for a file to
A lightweight, asynchronous plugin used to spawn corpses upon player death. Download options are available on the SpigotMC forums . 2. Horror Game & Media corpse
You can find various jar-related icons and scary-themed illustrations (like monsters in mason jars) for free download on Pngtree . Corpses 1.1 - Modrinth Files. corpse.jar(15.38 KiB) Primary. Download. Jar Of Jam Clipart Images | Free Download - Pngtree