Related Clues:

• Type of navel
• Belly button type
• Feature of many a stomach
• Lint-collecting bellybutton
• Noticeable navel
• Navel phenomenon
• Navel formation?
• Concave navel
• Concave button
• Type of 39-Down
• Concave lint trap?
• Navel designation
• Concave belly button
• Navel concavity
• It doesn't come out of the stomach