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Many shapes have metaphorical names, i.e., their names are metaphors: these shapes are named after a most common object that has it. For example, "U-shape" is a shape that resembles the letter U, a bell-shaped curve has the shape of the vertical cross-section of a bell, etc.
Hourglass shape or hourglass figure, the one that resembles an hourglass. If one takes two copies of a shape wide at one end that narrows to the other end and connects them symmetrically by the narrow ends, the resulting shape is usually called an "hourglass shape". In other words, an hourglass shape is a (nearly) symmetric shape wide at its ends and narrow in the middle. Some flat shapes may be alternatively compared to the figure eight or hourglass. The classical female body shape is often compared to an hourglass.
Oval (from the Latin "ovum" for « egg »), a descriptive term applied to several kinds of "rounded" shapes, including the egg shape
Pear shaped, in reference to the shape of a pear, i.e., a generally rounded shape, tapered towards the top and more spherical/circular at the bottom. The term acquired a number of metaphorical meanings.