konkavisia
Konkavisia is a hypothetical geometric concept representing a region characterized by inward-curving boundaries. Unlike convex shapes, where any line segment connecting two points within the shape lies entirely within the shape, konkavisia by definition possesses at least one concavity, meaning some internal line segments would pass outside the defined boundaries. The term is not a standard mathematical term and is likely a neologism or a term used in a very specific, perhaps theoretical, context.
The properties of a konkavisian region would be the inverse of convexity in many respects. For instance,