What does S/O stand for?
S/O
Select/Omit (SAUS)
Shipowner (SAUS)
Shippers Option (SAUS)
Shutoff (NAKS)
Sign Off
Smoke and Obscurant [A military operation] (MLEX)
Solvent to Oil (SAUS)
Son Of [Genealogy]
Sound Off
South Of [In outdoor advertising] (WDMC)
Split Off (SAUS)
Stitches (or staples) Out (SPVS)
Substance Of
S(O)
Seaman (Operator) [British military] (DMA)
S&O
Salpingo-Oophorectomy [Medicine] (EDAA)