Joining Group - E

E is a special value indicating that a character has no specific joining behavior in script contexts where letters connect or disconnect. It applies to characters that do not participate in cursive joining, such as spaces, punctuation, or symbols, meaning they neither force a connection with neighboring characters nor break a connection. When a character has the E joining group, it acts as a neutral element in text shaping, allowing adjacent joining characters to connect across it only if their own joining types permit, but it does not initiate or block a join itself. This value ensures that non-letter characters are handled consistently in bidirectional and shaping algorithms, preventing them from disrupting the visual flow of connected scripts like Arabic or Syriac. In practical terms, E is the default and most common group, covering all characters that are irrelevant to joining rules.