1. 
   SNI
   Siemens Nixdorf Informationssteme, AG
   Found op http://foldoc.org/SNI
   
   
2. 
   SNI
   signal-to-noise improvement
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
3. 
   SNi
   SNi or Substitution Nucleophilic internal stands for a specific but not often encountered nucleophilic aliphatic substitution reaction mechanism. The name was introduced by Cowdrey et al. in 1937 to label nucleophilic reactions which occur with retention of configuration, but later was employed to ...
   Found op http://en.wikipedia.org/wiki/SNi
   
   
4. 
   sni
   1) Signal-to-noise improvement
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/sni/1
   
   

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