# - Definitions

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    121 (one-to-one)

    In Internet e-commerce, 121 is short for one-to-one, the philosophy that treating each customer as a special individual is a more successful approach than treating customers as a group of similar individuals.

  • 99.999 (Five nines or Five 9s)

    In computers, 99.999 (often called "five 9s") refers to a desired percentage of availability of a given computer system.

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