signals

"The blinking lights on the modem sent signals indicating that the internet connection was working. "

"The flashing red lights on the school bus are signals that it's time to get on. "

"The crossing guard uses hand signals to stop traffic so children can safely walk to school. "

"The train conductor checked the signals before starting the train. "

"The radio signals were weak, so we couldn't hear the music clearly. "

"The flashing red light signals the end of the school day. "

"The dark clouds were signals of an approaching storm. "

"Despite the static, the radio still picked up clear signals from the weather station, helping us prepare for the storm. "

"The computer program uses signals to let the user know when it finishes loading a file. "

"The signals between the nerve cells allowed Maria to quickly pull her hand away from the hot stove. "

"The teacher signals the start of the test by raising her hand. "

"Seeing the flames, he ran to the control room and signalled headquarters."