FO

from WordNet (r) 3.0 (2006)

FO
    n 1: an officer holding the rank of major or lieutenant colonel
         or colonel [syn: {field-grade officer}, {field officer},
         {FO}]

from The Collaborative International Dictionary of English v.0.48

Fo \Fo\ (f[=o]), n.
   The Chinese name of Buddha.
   [1913 Webster]

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

fo

   <networking> The {country code} for the Faroe Islands.

   (1999-01-27)

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

FO
       Fiber Optic