U+25CB "○" White Circle Unicode Character

U+25CB "○" White Circle is a geometric symbol that represents a hollow, open circle with no fill, distinct from filled circles or other circular glyphs. It is frequently used in various contexts including bullet lists, diagrams, and user interfaces to denote an empty or unselected state, such as a radio button before selection. In mathematics and logic, it can signify a variable or a placeholder, while in Japanese culture, it is famously employed in the O mark (maru) to indicate correctness or approval. The white circle also serves as a visual element in maps, diagrams, and flowchart symbols, offering a clear, neutral shape for representing concepts like nodes, points, or cyclical processes.