Slinky

Etymology
The term was coined in 1943 by Betty James which means sleek and graceful

Noun

 * 1) A toy in the form of a loose metal (originally) or plastic spring that can be made to "walk" down stairs as its coils separate and close up.

Translations

 * French: Slinky, Ondamania
 * Norwegian: trappetroll
 * Russian: слинки