The term 'Less Common Bellybutton Type' refers to an 'Outie' bellybutton, which is a protruding navel that is less common than the more typical 'Innie' bellybutton. An Outie is created when the umbilical cord does not heal properly and leaves a small lump of scar tissue on the surface of the navel. Outies are usually more visible than Innies and can be seen in about 10-20% of the population.