| Acronym | Definition |
|---|
| SN | Serial Number |
| SN | Stannum (tin) |
| SN | Signal-Noise (ratio) |
| SN | Saturday Night (various organizations) |
| SN | Soon (amateur radio) |
| SN | Singapore |
| SN | Snow (METAR precipitation) |
| SN | Sierra Nevada |
| SN | Sequence Number |
| SN | Science News |
| SN | Sonora (Guatemalan radio station) |
| SN | Social Networking |
| SN | Surname (genealogy) |
| SN | Space Network |
| SN | Supernatural |
| SN | Symantec Norton (software) |
| SN | Screen Name |
| SN | Seaman (USCG, USN) |
| SN | Swindon (postcode, United Kingdom) |
| SN | Sans Nom |
| SN | Subscriber Number |
| SN | Sabena (Belgian World Airlines) |
| SN | Sintagma Nominal (Spanish language term) |
| SN | Steve Nash (NBA player) |
| SN | Stock Number |
| SN | Skilled Nursing |
| SN | Side Note |
| SN | Super Nova |
| SN | Substantia Nigra (neuroanatomy) |
| SN | Safety Notice (various companies) |
| SN | Super Nintendo |
| SN | Suicide Note |
| SN | Secretary of the Navy |
| SN | Samyutta Nikaya (Buddhist texts) |
| SN | Service Number |
| SN | Standard Number |
| SN | Screenname (usually AOL) |
| SN | Staff Nurse |
| SN | Stevie Nicks (Fleetwood Mac musician) |
| SN | Satellite Navigation |
| SN | Semantic Network |
| SN | Structural Number (highway engineering) |
| SN | Sacramento Northern (railroad) |
| SN | Solar Neutrino |
| SN | Super Nice |
| SN | Student Nurse |
| SN | Service Node |
| SN | Special Need (adoptions) |
| SN | Switching Network |
| SN | Sigma Nu (fraternity) |
| SN | Sûreté Nucléaire (French: Nuclear Safety) |
| SN | Sports Night (TV show) |
| SN | Server Node |
| SN | Serum Neutralization |
| SN | Succinonitrile |
| SN | Sialoadhesin |
| SN | Space Needle (Seattle, Washington) |
| SN | Super Node |
| SN | Sûreté Nationale (French: National Security) |
| SN | Soup Nazi (Seinfeld episode) |
| SN | Seat Nipple |
| SN | Surgical Nurse |
| SN | Shipping Note |
| SN | Sir Name (LDAP or Directory Servers) |
| SN | Singing News (southern gospel magazine) |
| SN | Stiffness Nominal |
| SN | Steeler Nation (sports website) |
| SN | Sthene (measure of force) |
| SN | Shared-Nothing Architecture (distributed computing architecture) |
| SN | Skilled Nurse |
| SN | Sem Número (Portuguese: having no number; postal usage) |
| SN | Soil Nail (construction) |
| SN | SorceryNet (IRC network) |
| SN | Shipping Noise |
| SN | Subjunctive Normal |
| SN | Separation Number (chromatography) |
| SN | Subnova (website) |
| SN | Secundum Naturam (according to nature) |
| SN | Sending Nation |
| SN | Slurry Nebulization (spectroscopy) |
| SN | Strategic Navigation |
| SN | Sveriges Naturvetareförbund (Nacka, Sweden) |
| SN | Source Nursery |
| SN | Shepherd Nick (website) |
| SN | Saucy Nipples (ARC gaming clan) |
| SN | Skule Nite (University of Toronto) |
| SN | Structural Notation |
| SN | Synchronization Node |
| SN | Slot Neighbor |
| SN | Portable Surface Search Radar (US Navy) |
| SN | Salutami 'Ntonio (Frisbee Ultimate Club di Milano) |
| SN | Superconducting Normally (conducting) |