Geometrical Shape with Connected Lines and Points

An abstract depiction on a dark background features a four-sided shape outlined by thick blue lines. Each corner of this shape is clearly marked with a yellow 'X' symbol on a light gray square. An additional, isolated yellow 'X' marker is positioned near the center of the image, not connected to the main structure. The overall arrangement suggests a basic geometric illustration of points and their connections.

geometry - shape - lines - points - abstract - quadrilateral - diagram