| SIN | Assassin 
| Others |
| SIN | Changi International Airport
| Others |
| SIN | Italian Society of Neurology
| Others |
| SIN | Safety In Numbers
| Others |
| SIN | Satan Is Nonsense
| Others |
| SIN | Secure Identification Number
| Others |
| SIN | Security of Information and Networks
| Others |
| SIN | Self I And Nobody
| Others |
| SIN | Self Imposed Nonsense
| Others |
| SIN | Self Induced Nihilism
| Others |
| SIN | Self Inflicted Non
| Others |
| SIN | Self Inflicted Nonsense
| Others |
| SIN | self-inactivating
| Others |
| SIN | Serbian Internet Network
| Others |
| SIN | Serial in
| Others |
| SIN | Service Industry Night
| Others |
| SIN | Servicio Inteligencia Nacional
| Others |
| SIN | Servicio Nacional de Inteligencia
| Others |
| SIN | Sex Industry Network
| Others |
| SIN | Shadow In the Night
| Others |
| SIN | Shadows In The Night
| Others |
| SIN | Signatures In Need
| Others |
| SiN | Silicon Nitride
| Others |
| SIN | Sine
| Others |
| SIN | Singapore, Singapore
| Others |
| SIN | Single Indetification Number
| Others |
| sin | Sinhala
| Others |
| SIN | SINonimo
| Others |
| SIN | Smuggler Interstellar Network
| Others |
| SIN | Social Insurance Number
| Others |
| SIN | Software Identification Number
| Others |
| SIN | Solitude In Nothingness
| Others |
| SIN | Someday Is Now
| Others |
| SIN | Somewhere Into Nowhere
| Others |
| SIN | Soroptimist International of Napa
| Others |
| SIN | Sorry Imma N
| Others |
| SIN | Soul In Need
| Others |
| SIN | South Australian Sex Industry Network
| Others |
| SIN | Spanish International Network
| Others |
| SIN | Special Item Number
| Others |
| SIN | Spill It Now
| Others |
| SIN | Static Ip Notification
| Others |
| SIN | Stop the Interchange Now!
| Others |
| SIN | Strange Inbred Nomads
| Others |
| SIN | Stranger In The Night
| Others |
| SIN | Strength In Numbers
| Others |
| SIN | Student Information Network
| Others |
| SIN | Student Infraction Notice
| Others |
| SIN | Study Information Network
| Others |
| SIN | Style Is Necessity
| Others |
| SIN | Substitute It Now
| Others |
| SIN | Success Ignoring Nature
| Others |
| SIN | Success In Nothing
| Others |
| SIN | Super Intelligent Network
| Others |
| SIN | Supreme International Nerwork
| Others |
| SIN | Supreme Internvational Network
| Others |
| SIN | Sweet, Innocent & Naive
| Others |
| SIN | System Improvement Note
| Others |
| SIN | System In Nature
| Others |