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Why some thread's title have Capital B written in a square

  1. Aug 14, 2015 #1
    I have seen some answered thread having Capital B in a square?why is that so?
  2. jcsd
  3. Aug 14, 2015 #2
    Some have A and I .WHY?What these alphabets stand for?
  4. Aug 14, 2015 #3
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