binnekant
Binnekant is a Dutch word that translates to "inside" or "interior" in English. It is commonly used to refer to the inner surface or part of an object, contrasting with the outer surface or exterior. For example, one might speak of the binnekant of a shoe, meaning the part that touches the foot, or the binnekant of a house, referring to its interior rooms and spaces.
The term can also be used more abstractly to describe the inner workings or essence of something.