Mumetal

[ moo-met-l, myoo- ]
/ ˈmuˌmɛt l, ˈmyu- /

noun

an alloy containing nickel, iron, and copper, characterized by high magnetic permeability and low hysteresis losses.

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Origin of Mumetal

Formerly a trademark; mu (representing the Greek letter, a conventional symbol for permeability) + metal
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021