ASCII Hex Digit - Yes

Yes is the designation for a character that qualifies as an ASCII hexadecimal digit, meaning it is one of the ten decimal digits (0 through 9) or one of six letters (A through F, in either uppercase or lowercase) that are used to represent values in base 16. This affirmative value confirms that the character’s shape and code point align strictly with the standard ASCII range, excluding any accented, fullwidth, or non‑Latin variants. It directly enables parsers and algorithms to quickly validate whether an input character can be used in hexadecimal notation without additional conversion or lookup tables, making it a fundamental check for encoding, color codes, memory addresses, and binary‑to‑hex conversions. The flag is binary in effect, offering a clear yes or no answer for each character, and its practical utility lies in that unambiguous, immediate recognition of a narrow, well‑defined set of symbols.