A set of shelves is commonly referred to by several descriptive terms depending on its construction and placement, including a bookcase, shelving unit, bookcase stack, rack, étagère, or tier system. When multiple shelves are mounted vertically on a wall or housed within a freestanding frame, they are collectively called a shelving unit or a bookcase. In industrial and commercial warehouse settings, heavy-duty multi-level configurations are universally known as pallet racks or industrial shelving bays.
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