What is the device called that supports caskets stacked one above the other for display?

The device that supports caskets stacked one above the other for display is referred to as a casket rack. This structure is specifically designed to hold multiple caskets securely and allow them to be viewed at the same time, facilitating arrangements in a funeral setting where space and presentation are important. Casket racks can vary in design and materials but are primarily used to exhibit caskets in a way that is accessible and visually appealing for families and attendees.

Other options may refer to different devices used in funerary contexts. For instance, a bier is typically a frame or platform where a body is placed for transport or display during a wake or funeral service, while a casket standard typically holds a single casket rather than multiple. A catafalque refers to a raised platform or framework that can be used for displaying a casket, especially during a ceremony or memorial, but it is generally not used for stacking multiple caskets. Therefore, the casket rack is the most accurate term for the device described in the question.