C12
C12、C-12或C.XII可指：
- ICD-10代码中：梨状窝的恶性肿瘤
- 碳-12，C-12，碳的同位素之一
- NGC 6946的科德韦尔天体代码，也称为“焰火星系”
- 12世纪的缩写
- C-12休倫運輸機
- 12号染色体的缩写
- 法兰西防御的ECO编号之一
| B12 | ||
| C11 | C12 | C13 |
| D12 | ||
| C12 | - | 12C |
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