Wordnet 3.0
NOUN (1)
1. 
 an artificial language for international use that rejects all existing words and is based instead on an abstract analysis of ideas; 
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
V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):
RO
       Read-Only (I/O)
The Free On-line Dictionary of Computing (30 December 2018):
ro
    The country code for Romania.
   (1999-01-27)