Term: gamma iron: a nonmagnetic allotrope of iron that is the basis of austenite; stable between 906 and 1403 degrees centigrade
Broader: iron: a heavy ductile magnetic metallic element; is silver-white in pure form but readily rusts; used in construction and tools and armament; plays a role in the transport of oxygen by the blood | Unrelated: combination: a sequence of numbers or letters that opens a combination lock