One of the mysteries of the English language finally explained.
1Military. A relatively small division of troops which may be deployed independently of the army or larger body to which it belongs.
2A large van or trailer equipped to provide a particular service or facility (originally especially a medical one), which tours a particular area or is driven to where it is needed.
3A portable telephone; a cellphone.
4A portable radio receiver or transceiver; especially one installed in a motor vehicle.
5A portable form of any device.
Late 19th century. From mobile + unit [adjective].
mobile unit/ˈməʊbʌɪl ˌjuːnɪt/
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