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Electrical Applications 2 by David W. Tyler

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Materials and their applications in the electrical industry 59
They have a permeability which lies between that for nearly pure
iron and the grain-oriented variety. Since they contain no silicon,
their resistances are low. Their high permeability and low resistance
make them suitable as screening materials. Mumetal was so named
after the Greek letter μ, which is used as the symbol for permeability.
4 Hard alloys. These alloys are so hard as to be unrollable when
cold, and cannot be filed or bent. They are cast into blocks from the
molten material and can only be shaped using a high-speed grinding
wheel. Such materials would be found in tools such as files,