Hex Digit - No
No is the designation for characters that are not considered valid hexadecimal digits, meaning they lack the ability to represent numeric values 0 through 9 or the letters A through F (or a through f) in a hexadecimal numbering system. This applies to all symbols, punctuation, letters outside the specified ranges, and digits from other numeral systems, such as those in Arabic or Devanagari scripts. In technical contexts, such characters cannot be parsed or encoded as part of a hexadecimal literal, and they are explicitly marked as non-hex, ensuring that parsers and algorithms reject them when interpreting base-16 data. Essentially, a "No" value signals that the character holds no hexadecimal numeric meaning, regardless of its visual resemblance to digits or letters.