The big shelves in warehouses are called pallet racks or industrial shelving units.

Pallet racks are a type of shelving system that is designed to store palletized materials. They consist of upright frames, horizontal beams, and wire decking or pallet supports. Pallets are placed on horizontal beams and can be easily accessed with a forklift or other material-handling equipment.

Industrial shelving units, on the other hand, are designed to store smaller items or products that are not palletized. They can be made of metal or other materials and can come in a variety of sizes and configurations. Some common types of industrial shelving units include boltless shelving, wire shelving, and mobile shelving.

Both pallet racks and industrial shelving units are commonly used in warehouses and distribution centers to maximize storage space and improve efficiency.

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