3I
3I、3i或3-I可以指：
- 化学式3I，表是3个碘原子
- 3i：距离原点三个单位的纯虚数、高斯整数
- Iniziative Industriali Italiane
- 3I Sky Arrow
- 3i (公司)：总部位於伦敦的私募股权和创投公司
| 2I | ||
| 3H | 3I | 3J |
| 4I | ||
| 3I | - | I3 |
参见
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