ro

from WordNet (r) 3.0 (2006)

Ro
    n 1: an artificial language for international use that rejects
         all existing words and is based instead on an abstract
         analysis of ideas

from The Free On-line Dictionary of Computing (8 July 2008)

ro

   <networking> The {country code} for Romania.

   (1999-01-27)

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

RO
       Read-Only (I/O)