A term meaning "spinning top" in Greek which was coined by J. H. Conway by e-mail in the Polyhedron Discussion List as a term for kite-shaped quadrilaterals.
Formally, a strombus is a quadrilateral 
that has 
for an axis of symmetry.
Strombus
See also
Diamond, Kite, Lozenge, Parallelogram, Quadrilateral, Rhomboid, Rhombus, Skew Quadrilateral, TrapezoidExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Strombus." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Strombus.html