U+1DA9C "𝪜" Signwriting Fill Modifier-3 Unicode Character

U+1DA9C "𝪜" Signwriting Fill Modifier-3 is a diacritic-like symbol within the Sutton SignWriting block, used to modify the appearance of a signwriting base sign by indicating a specific level of fill or solidity. This particular modifier corresponds to a three-quarter fill, meaning that the interior of a handshape or movement glyph is rendered with a dense, mostly filled pattern, leaving only a quarter of the area unfilled to represent nuanced articulation or visual distinction in sign language notation. It is part of a system of fill modifiers that allow signwriters to precisely depict variations in handshape closures, contact, or movement dynamics, thereby enhancing the clarity and detail of written signed languages.