| m/i | most important |
|---|---|
| M/L | monocyte/lymphocyte [ratio] |
| m/r | mass attenuation coefficient |
| m/s | meters per second |
| m/s2 | meters per second squared |
| m/sec | meters per second |
| m/z | mass-to-charge ratio |
| M1 | mitral first [sound]; myeloblast; slight dullness |
| M2 | dose per square meter of body surface; marked dullness; promyelocyte |
| m2 | square meter |