3I
3I、3i或3-I可以指：
- 化學式3I，表是3個碘原子
- 3i：距離原點三個單位的純虛數、高斯整數
- Iniziative Industriali Italiane
- 3I Sky Arrow
- 3i (公司)：總部位於倫敦的私募股權和創投公司
| 2I | ||
| 3H | 3I | 3J |
| 4I | ||
| 3I | - | I3 |
參見
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