A handheld radio transceiver unit.  The term can also refer to its original sense, an earlier form of portable military radio with the transciever and battery pack carried on the operator's back; these were so named because, unlike previous radio sets that had to be assembled before they could be used, it could be used while the soldier equipped it was walking.  (The first fully handheld two-way radios were called [i]handie[/i]-talkies to differentiate them from the backpack-mounted walkie-talkie; only after the backpack units became fully obsolete and went out of service did the term transfer to the handheld type.)
トランシーバー