no they come from the sky and they fall on people and kill them.
Semaphores are any means of communication when flags or lights are employed to communicate . For example , semaphore flags are used to convey messages from one ship to another and traffic lights are a means in which to communicate a signal to traffic . See related link below .
The plural form of the word signal is signals.
Semaphore was invented as a visual signaling system to relay messages over long distances. It was developed to communicate with ships at sea or between different points on land where other methods of communication like smoke signals or flags were not practical. Semaphore systems used different flag positions to represent different letters or words and were widely used before the invention of the telegraph.
Transmission Media
Signal is a noun (a signal) and a verb (to signal).
Lights went out.
Set-top- box signal
The plural form of the noun light is lights.The plural possessive form is lights'.
Because cars are a form of transportation.
A digital signal requires a repeater, which retransmits the signal in its original form, and an analog signal requires an amplifier, which increases the strength of both the signal and the noise it has accumulated.
The possessive form of the plural noun cars is cars'.Example: All of the cars' owners have been notified.
It is high frequency carrier signal and low frequency carrier signal in Am detector in the same way of wave form as a result of graph...