Digit Eight

8 (Eight) is ASCII code point 56 (0x38), Unicode U+0038, and a printable character in the Digit category. It is 2³, the cube of the smallest prime, and the number that ties binary to human-readable computing — eight bits make a byte, the atom of modern data. The byte is eight bits because of the IBM System/360, which standardized the width in 1964 and dragged the rest of the industry along. That decision echoes everywhere: octets in networking, 256 possible values for a color channel, `uint8_t` as the smallest addressable integer in C. Octal notation groups binary digits in threes, but hex groups them in fours — and since a byte is eight bits, hex won cleanly, two hex digits per byte. The infamous `parseInt("08")` bug in older JavaScript happened precisely because the leading zero triggered octal parsing, and 8 is not a valid octal digit. CSS color values pack three bytes into six hex characters (`#FF8800`), each pair governing one of the RGB channels — a format that only makes sense because a channel is eight bits wide. The glyph is topologically unique among digits: it is the only one with two enclosed regions. This makes it a favorite example in computer vision courses when teaching connected-component analysis and hole counting. UTF-8 encodes it as 0x38, a single byte, with the standard subtraction giving its numeric value. Unicode classifies it as Nd with the name DIGIT EIGHT. The infinity symbol ∞ (U+221E) resembles a sideways 8, and while no serious parser would confuse them, the visual kinship is old enough that some typographers believe the symbol was deliberately derived from the digit — though the actual etymology remains disputed.