XID Continue - Yes
Yes is the designation for characters that can appear after the first character in a programming identifier, meaning they are allowed as continuations in variable names, function names, or other lexical tokens. This includes letters, digits, underscores, combining marks, and certain other symbols, but crucially it excludes spaces, punctuation like hyphens or periods, and most mathematical operators. The value also covers characters that might not be obvious, such as zero-width joiners or non-spacing marks, ensuring that identifiers can be written in many scripts, including those with diacritics or complex writing systems. In practice, if a character holds this value, it can safely follow the initial character without breaking the identifier’s validity in most modern programming languages, making it essential for parsing and compiler design.