> Mach's name Mach evolved in a euphemization spiral: While the developers, once during the naming phase, had to bike to lunch through rainy Pittsburgh's mud pu

> Mach's name Mach evolved in a euphemization spiral: While the developers, once during the naming phase, had to bike to lunch through rainy Pittsburgh's mud puddles, Tevanian joked the word muck could serve as a backronym for their Multi-User [or Multiprocessor Universal] Communication Kernel. Italian CMU engineer Dario Giuse later asked project leader Rick Rashid about the project's current title and received "MUCK" as the answer, though not spelled out but just pronounced as IPA: [mʌk] which he, according to the Italian alphabet, wrote as Mach. Rashid liked Giuse's spelling "Mach" so much that it prevailed. It's fascinating how some things get their names :)