navel
— Noun
– English
～ the center point or middle of something; "the Incas believed that Cuzco was the navel of the universe"
navel
— Noun
– English
～ a scar where the umbilical cord was attached; "you were not supposed to show your navel on television"; "they argued whether or not Adam had a navel"; "she had a tattoo just above her bellybutton"
navel-gazing
— Noun
– English
～ literally, the contemplation of one's navel, which is an idiom usually meaning complacent self-absorption