Tiddie gap

(N.) A tiddie gap, sometimes referred to as titty gap, is a term used to define a pronounced space created by the sternum found between the pectorals/breasts on the chest of some human males or females. Tiddie gaps are genetic, can very in size and severity and are generally considered harmless, although some complain that they are a aesthetic or athletic handicap.

Henry Cavill has the world’s most famous tiddie gap.