Welcome to Smogon! Take a moment to read the Introduction to Smogon for a run-down on everything Smogon, and make sure you take some time to read the global rules.
SV is shiny value. Each trainer has a TSV (trainer shiny value) and every egg has an ESV (egg shiny value). If a player hatches an egg whose ESV is the same as the trainer's TSV, the egg will hatch shiny.
Your TSV is useful for hatching others' eggs. If you want your eggs hatched shiny, you'll need to check each egg you want shiny's ESV and find a person with that TSV to hatch it.