Joining Group - Knotted Heh

Knotted Heh is a joining group designation for a specific form of the Arabic letter heh, distinguished by its visually knotted or looped shape, which appears in certain historical and stylistic scripts. This character class affects how the letter connects to adjacent letters in cursive text, particularly in Arabic and related writing systems, by defining its right and left joining behavior. Unlike the standard heh, the knotted variant maintains a closed, tied appearance even in isolated or final positions, influencing typographic shaping and rendering. Its behavior ensures proper ligature formation and contextual substitution, preserving the intended orthographic tradition in manuscripts and digital fonts that support this variant.