MX
Initialism of Missile, Experimental (original project name of the LGM-118 Peacekeeper ICBM).
Proper noun
- Initialism of Missile, Experimental (original project name of the LGM-118 Peacekeeper ICBM).
Noun
- Abbreviation of mail exchanger.
- Abbreviation of motocross.
- Abbreviation of Maltese Cross, a cancellation mark appearing on early British stamps.