DSLAM
Multiple networks
A digital subscriber line (DSL) modem is a device used to connect a computer or router to a telephone circuit that has digital subscriber line service configured.
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Video splitter or multiple video cards
The purpose of an HDMI splitter box is usually to connect multiple high-definition devices to an HDTV. The purpose of an HDMI splitter box is usually to connect multiple high-definition devices to an purpose of an HDMI splitter box is usually to connect multiple high-definition devices to an HDTV?
Because copper can connect one thing to another so there are multiple wires to connect multiple things
bluetooth
In relation to communications - SIM stands for Subscriber Identity Module. It's the tiny card inside a mobile phone (or other device) that allows it to connect to the network.
Linking multiple computers together is known as a Computer Cluster. Look that up and you should have your answer.
router
to connect multiple storage devices for redundancy or speed
Multiple air sacs connect to lungs. By Milo Magallanes.