Definition of "SN"

Initialism of screen name.  examples

Initialism of social network.  examples

Initialism of social networking.  examples

(chemistry) Initialism of steric number.  examples

(neuroanatomy) Initialism of substantia nigra.  examples

(train control) Initialism of STM National.  examples

Initialism of serial number.  examples

(computing) Initialism of shared-nothing.  examples

(astronomy) Abbreviation of supernova.  examples