Warehouse Question - Someone who is APICS certified might know?

When a warehouse puts skids in "random" slots in order to save space rather than put specific items in specific spots. What is that called again? or:

When a warehouse puts skids in "random" slots in order to save space rather than put specific items in specific spots. What is that called again?

or:When a warehouse puts skids in \"random\" slots in order to save space rather than put specific items in specific spots. What is that called again?

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