Source : Webster's Revised Unabridged Dictionary (1913)

Oo \Oo\, a.
   One. [Obs.] --Chaucer.

Oo \O"["o]\, n. [Hawaiian.] (Zo["o]l.)
   A beautiful bird ({Moho nobilis}) of the Hawaiian Islands. It
   yields the brilliant yellow feathers formerly used in making
   the royal robes. Called also {yellow-tufted honeysucker}.

Source : Free On-Line Dictionary of Computing

OO
     
        {object-oriented}