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usr stands for UNIX system resources

• iso947 6y ago
  Backronym. Home directories were originally stored in /usr, as are another user programs “ In particular, in our own version of the system, there is a directory "/usr" which contains all user's directories, and which is stored on a relatively large, but slow moving head disk, while the othe files are on the fast but small fixed-head disk. “
• NelsonMinar 6y ago
  "Referer" stands for "referrer".