U+1CD81 "𜶁" Block Octant-158 Unicode Character

U+1CD81 "𜶁" Block Octant-158 is a symbol assigned to a specialized block of the Unicode Standard known as the "Block Octants," which is designed for technical and geometric notation. This particular octant represents a specific subdivision of a full block character, encoding a visual shape that fills one eighth of a square area, typically used in terminal graphics, legacy font rendering, or low resolution pixel art to construct partial block shading patterns. It belongs to a set of characters that allow for fine grained control over text based diagrams and monochromatic imagery.