Term: beta iron: an allotrope of iron that is the same as alpha iron except that it is nonmagnetic; stable between 768 and 906 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: sea otter: large marine otter of northern Pacific coasts having very thick dark brown fur