Joining Group - Manichaean Heth

Manichaean Heth is a joining group value that defines how the Manichaean letter Heth connects to adjacent letters in scripts using cursive or connected writing. It specifically identifies Heth as a letter that joins on both sides, meaning it forms a connective link with the preceding and following characters, unlike letters that join only on one side or remain isolated. This behavior is crucial for rendering Manichaean text correctly, as it determines the visual shape and ligature formation of Heth within words, ensuring that the script appears natural and legible when displayed. The value helps text shaping engines apply the proper contextual forms for Heth in different positions, such as initial, medial, or final, without relying on generic rules that might apply to other letters.