Intercom

Rarity: Common

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At a glance

Class

Notion

Domain

Science and technology

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What Wikipedia says

An intercom, also called an intercommunication device, intercommunicator, or interphone, is a stand-alone voice communications system for use within a building, small collection of buildings or portably within a small coverage area, which functions independently of the public telephone network.

Excerpt from the Wikipedia article “Intercom”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: MyName (Nono365), CC BY-SA 3.0, via Wikimedia Commons.