SGS is a three letter acronym that can stand for:

The Sustainable Grazing Systems Pasture Model: description, philosophy and application to the SGS National Experiment
SGS Expands West Chester Facility and Increases Protein Structural Analysis Services
Rainout Shelters on SGS
Postcard From SGS 2005: Wargaming Science
Hybrid LES‐RANS modelling: a one‐equation SGS model combined with a k–ω model for predicting recirculating flows
Arabidopsis SGS2 and SGS3 Genes Are Required for Posttranscriptional Gene Silencing and Natural Virus Resistance
Self-Assembly of Discoidal Phospholipid Bilayer Nanoparticles with Membrane Scaffold Proteins
Srs2 and Sgs1-Top3 suppress crossovers during double-strand break repair in yeast.
Functional overlap between Sgs1-Top3 and the Mms4-Mus81 endonuclease
DNA end resection by Dna2-Sgs1-RPA and its stimulation by Top3-Rmi1 and Mre11-Rad50-Xrs2