Upper Half Inverse White Circle

Upper Half Inverse White Circle at U+25DA is a geometric symbol showing a circle with its upper half filled and its lower half left open. It is part of the Geometric Shapes block, where it sits among circle, square, triangle, and half-filled shape symbols used as compact visual markers rather than letters or punctuation. In practice it appears most often in technical symbol palettes, chart legends, and UI icon sets when a designer needs a simple half-state indicator: partly selected, mixed status, semi-active, or a two-part category marker. It can also be used in diagrams and tables to distinguish one condition from related circle symbols, such as a fully filled circle, an empty circle, or the opposite lower-half-filled form. The character has no standard mathematical value or universal convention, so its meaning depends on the document, legend, or interface that defines it. Because it is a relatively specialized geometric shape, fonts may style its fill balance and circle weight differently, and some environments may substitute a less precise fallback symbol.