X12
X12、X-12或X12可以指：
- Sony Ericsson Xperia Arc（Xperia X12）：智能手机型号
- ANSI ASC X12：互联网媒体类型
- SL X12：瑞典列车
- 中国图书馆分类法 (X)：X12 环境数学
| W12 | ||
| X11 | X12 | X13 |
| Y12 | ||
| X12 | - | 12X |
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