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The IP Code consists of the letters IP followed by two digits and an optional letter. More at
Wikipedia
IP address - An Internet Protocol address is a numerical label that is assigned to devices participating in a computer network that uses the Internet Protocol for communication between its nodes.
EN 50102 – IK code on resistance to mechanical impacts
MIL-STD-810 - The United States Military Standard referred to as MIL-STD-810, "Department of Defense Test Method Standard for Environmental Engineering Considerations and Laboratory Tests" emphasizes tailorin...
National Electrical Manufacturers Association - The National Electrical Manufacturers Association or NEMA is a U.S.-based association, which was created on September 1, 1926, when the Associated Manufacturers of Electrical Supplies ...
Water Resistant mark on wrist watches
U.S. Military connector specifications for military equivalents
