signal
US /ˈsɪɡ.nəl/
UK /ˈsɪɡ.nəl/

1.
sinal, indicação
a gesture, action, or sound that conveys information or an instruction
:
•
He gave a signal to the driver to stop.
Ele deu um sinal para o motorista parar.
•
The traffic light changed to a green signal.
O semáforo mudou para um sinal verde.
2.
sinal, onda
an electrical impulse or radio wave transmitted or received
:
•
The phone has a weak signal here.
O telefone tem um sinal fraco aqui.
•
The radio signal was clear.
O sinal de rádio estava claro.