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They avoid using the "shi" or "shichi" forms because "shi" also means "death".

• arghwhat 3y ago
  Same in China with 4 (sì), although they have no issue with 7 (qī). It makes a mess of hotel floors that try to cater to many cultures.
  • dawnofdusk 3y ago
    qī and sì sound nothing alike in any dialect of (Mandarin) Chinese I can think of, to Chinese speakers. Shi and shichi literally contain the exact same phoneme.
    • arghwhat 3y ago
      Someone unfamiliar with the languages might have thought that if they share the issue and even (within their phonetic limitations) pronunciation for the number 4 that this would also apply to 7, hence why I clarified that this was not the case.