oven rack.
Older ovens sometimes had racks that look surprisingly different from modern ones. DiscoverInduction Cooktops
And if the home once had a large range that has since been replaced, an old rack could have been left behind.
Check the oven itself for:
Empty rack supports
Rails
Side grooves
Brackets
Unused mounting holes
Evidence of an older appliance
Those clues could solve the mystery very quickly.
Could It Have Been Part of a Warming Drawer?
Here’s another possibility that’s easy to overlook.
Some ranges and older kitchen setups included warming
