Related Clues:

• Toilet seats, e.g.
• They follow one in a million?
• Roundish shapes
• Egg shapes
• 0000
• W.W. II aircraft
• Many racetracks
• Imperfect circles
• Locket shapes
• Nascar circuits
• Faces, more or less
• Nobodies
• Ellipsoids
• Flattened circles
• Some goose eggs