automatic calling unit; ACU
Computing term for a device that automatically places calls or pages.
This system uses an automatic calling unit to page the person in charge in an emergency.
Standard kanji spelling.
Variant with 呼出し instead of 呼び出し; both are used.
Compound of 自動 (automatic) + 呼び出し (calling, paging) + 装置 (device, apparatus).