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  1. Institutional review board, a committee that reviews the designs of proposed experiments to confirm whether all the methods proposed are ethical. (more: Institutional review board at Wikipedia)
  2. Investment review board, a committee of business executives who review investment choices, comparing against strategy and opportunity costs.
  3. Internal review board, another name for an internal affairs division of a police department (more: Internal affairs (law enforcement) at Wikipedia)
  4. Internal-ratings-based approach.
  5. Irish Republican Brotherhood, a secret organisation dedicated to the establishment of an "independent democratic republic" in Ireland between 1858 and 1924.
  6. (rugby, historical usage) International Rugby Board, the name used by World Rugby, the worldwide governing body for rugby union, from 1998 to 2014.