Acronyms, Abbreviations, and Initialisms.
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The meaning of the Acronym R.R. is...

R.R. is

  • Railroad

R.R. is also in:

Acronym Definition Searched: NAVI AMM WFWC FLT 90075 IMP MYC 83428 GETC IM MCAR CTC GR DSS 98807