IN
| Abbreviation | Meaning | Tamil Meaning | Category |
|---|---|---|---|
| IN | Information Systems Directorate (KSC) | - | Organizations |
| IN | Inlet | - | Organizations |
| IN | India (FIPS 10-4 Country Code; ISO 3166 Digram) - Indiana (postal Symbol) - Infantry | - | Astronomy |
| IN | Indium | - | Astronomy |