Usually a circle. Some might argue that some solid figures such as spheres and cylinders are also round.
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A circle has no vertices and is round.
Nobody's head is perfectly round. It is a free-form shape. Everybody's is a different shape.
Run a piece of string round the edge and then measure it
Cylinder is a shape, like a soda can, a cone is another shape, like the tip of a sharpened pencil, a sphere is yet another shape, something round like a ball.
Since a sphere is round it is a shape without a face.