Joining Group - Heh

Heh is a joining group that defines how the Arabic letter heh behaves when connected to adjacent characters in cursive scripts like Arabic and Syriac. It specifies that the letter takes a dual-joining form, meaning it can connect to both the preceding and following letters, creating a smooth right-to-left ligature flow. This group is distinct from other heh variants, such as heh goal or knotted heh, which have different connection patterns or shapes. In practical terms, the Heh group ensures that the standard heh character displays with proper medial and initial forms when positioned between other joining letters, while also allowing for a final isolated form at word endings. Its primary role is to maintain legible and consistent text shaping across different fonts and rendering engines.