An OBLONG is generally a rectangular shape with the two shortest ends in semi-circular form.
it is a heart looking shape. and the ends are rigid
Rectangle
The name given to the shape of a sagging rope supported at its ends is a catenary.
The shape of an almond is an oval with quite sharp ends. amygdaloid
It is an angle
Oval?
A cuboid is one possibility.
circle
triangle
Waterspout.
Tetrahedron.