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Similar to a question I asked earlier on, but I am now looking at S&P's sovereign ratings. Here, as in the case of Moody's, a few things are unclear to me in terms of the definitions used by Standard & Poor's.

  1. Several sovereign ratings (Foreign Currency LT Debt, obtained through CSDR in Bloomberg Terminal), contain a suffix u. For the case of Belgium, example given, ratings are denoted as AAu or AA+u. What does the u stand for?

  2. What does the rating SD stand for?

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