Alumel
/ˈal(j)ʊmɛl/noun
A trademark for: a nickel alloy, typically containing approx. 2 per cent aluminium, 2.5 per cent manganese, and 1 per cent silicon, used in thermocouples, often in conjunction with Chromel.
Origin
Early 20th century; earliest use found in The Trade Marks Journal. From alum- + -el.