sao

from The Collaborative International Dictionary of English v.0.48

Sao \Sa"o\, n. (Zool.)
   Any marine annelid of the genus {Hyalinaecia}, especially
   {Hyalinaecia tubicola} of Europe, which inhabits a
   transparent movable tube resembling a quill in color and
   texture.
   [1913 Webster]

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

SAO
       Server Activated Object

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

SAO
       Source Address Omitted [flag] (CATNIP)

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

SAO
       Session At Once (CD)