U1
U1、U 1或U-1可以指：
- 一种酉群
- U-1号潜艇 (1906年)，德国潜艇
- U1剪接体RNA
- 创世纪 (游戏)，Ultima I: The First Age of Darkness
- U1.11，超大类星体群
| T1 | ||
| U0 | U1 | U2 |
| V1 | ||
| U1 | - | 1U |
另见
- UI(消歧义)
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