Another possibility is a baker’s rack or microwave stand. These look more like furniture with flat or wire shelves. They are sized to fit neatly beside an oven or in kitchen alcoves, providing extra counter space and storage for appliances, cookbooks, or plants.

It could also be a spare oven rack for a double wall oven or large range. These are single flat metal grids with raised feet or hooks designed to create an additional baking level inside the oven.
How to identify it: Wheels and heavy wire construction mean it’s a valuable commercial speed rack worth keeping for baking. If it resembles shelving, it’s a baker’s rack. A single flat grid with hooks is likely a spare oven rack. Sturdy metal racks are almost always useful upgrades rather than junk. If it has unique features, describe them for a more precise identification!