BR seems to be an odd abbreviation for Ramada Renaissance, Stouffer Renaissance, Renaissance Hotels International, or Renaissance Hotels and Resorts by Marriott.

I found this list of hotel codes using Google: http://www.ccrainternational.com/too...lCompanies.htm

There's no RH, I doubt it's a complete list. Many of the codes are less-than-perfect abbreviations.

My first stay at a Renaissance was at the Ramada Renaissance Hotel in Aurora, Colorado, around 1983 or 1984, long before Marriott acquired Renaissance in 1997.

It is, however, interesting that Marriott Rewards uses the BR for Renaissance instead of something more meaningful. According to the list, the code for Fairfield Inn by Marriott is FN, but Marriott Rewards uses the more meaningful code FI.

At least it's not as bad as airline codes. Southwest is WN.