A heliograph is a device for sending messages or signaling by flashing the sun's rays from a mirror.
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A signaling device.
A sound signaling device
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A Sound Signaling Device.
Signaling System 7 managed traffic flow through a telephone network
Information can be transmitted through three main signaling methods: electrical signaling, chemical signaling, and mechanical signaling. Electrical signaling involves the use of electrical impulses, while chemical signaling relies on the transmission of neurotransmitters or hormones. Mechanical signaling involves physical interactions that convey information, such as touch or pressure.
Sound signaling device
mouse = (animal, computer device)
An apparatus for signaling is a device used to attract attention or communicate a message. This can include items like a whistle, a flag, or a flare, which are commonly used in emergency situations to call for help.
There are generally three types of cell signaling: autocrine signaling (cell signals itself), paracrine signaling (cell signals nearby cells), and endocrine signaling (cell signals distant cells through hormones).