U+FC21 "ﰡ" Arabic Ligature Sad with Meem Isolated Form Unicode Character

U+FC21 "ﰡ" Arabic Ligature Sad with Meem Isolated Form is a typographic presentation form used in the Arabic script, representing a ligature that combines the letters Sad (ص) and Meem (م) into a single glyph, specifically in its isolated form for standalone use. This character belongs to the Arabic Presentation Forms-A block, which is designed to accommodate contextual shaping and calligraphic styles common in traditional Arabic writing, such as in the Nastaliq or Naskh scripts. Its primary purpose is to ensure accurate visual rendering and support for legacy text encoding, where such ligatures are necessary for proper display in publications or digital environments that require precise character shapes.