| XMM | X-ray Multi-mirror Mission | X射线太空望远镜 |
| XMM | eXtended Memory Manager | 扩充内存管理程序 |
| XMM | XRay Multimirror (telescope) | X射线多镜（望远镜） |
| XMM | X-ray Multi- Mirror satellite | X射线多镜卫星 |
| XMM | X-Ray Multi-Mirror observatory (European Space Telescope) | X射线多镜天文台（欧洲太空望远镜） |
| XMM | Cross Media Marketing (delisted) | 跨媒体营销（退市） |
| XMM | High Throughput X-Ray Spectroscopy Mission | 高通量X射线光谱学任务 |