Computing

One plate, many entries

The banner is a family signal. Each entry keeps its own meaning and receives the same copper accent without repeating a full image.

• 42ASCII asterisk

  The asterisk is character 42 in ASCII. Unicode keeps it as U+002A ASTERISK. Asteriskos in Greek is a little star. The committee did not choose 42 because it meant star.

• missAsterism

  ⁂ looks like a star pattern, and the code point ends in 42. 2042 there is hex. It is not the number 42. * passes. ⁂ fails.

• Rule 42Elementary CA 42

  Among 256 elementary rules numbered 0–255, Rule 42 is one code. The number is a binary address, not a metaphysics.

• FORTYtwoFORTYtwo

  When a telemetry recording is damaged, a machine looks for the eight letters FORTYtwo. That marker says: here is a directory. Here is how to find the rest. A recovery word, written into the standard.

• 42Horizons 42 keywords

  The tool that looks up Vesta and Eros offers forty-two search fields. JPL’s own manual says: type SB for a list of 42 field keywords. A count in the docs, not a sky measurement.

• 42IANA port 42

  The internet’s list of door numbers gives 42 to Host Name Server. Name lived there before DNS took port 53. One well-known port among 1024.

• [42, 21, 10]Quadratic residue code of length 42

  Forty-two seats in a circle. You choose ten. The rule is so strict that any three seats you point to sit together in exactly eighteen of those choices. The length is not a programmer’s joke. It is the extended quadratic-residue code of the prime 41. Pattern inside the code makes another pattern: a 3-design.

• RFC 42RFC 42

  The forty-second Request for Comments. It asks that the first eight bits of an ARPANET message name the type of the rest. Sequential numbering. The content is about how a message says what it is.

• 42TIFF 42

  Before a machine can see a TIFF picture, it meets 42. Bytes 2 and 3 of the file say whether this is a TIFF at all. The standard calls it an arbitrary but carefully chosen number.