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47:8 ·
This sign on pushbuttons or keys of office machines means total clearance or back to zero. When one presses this key the machine deletes all stored data and is ready to be used for new activities.
Used as a modern washing information sign on clothes  has the meaning cannot be dry-cleaned.
In old marine technology and navigation it appeared as a sign for the widest section of a ship, dead flat. Here is related to  for center of gravity.
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