This is the 674th most frequent Portuguese word.
sinal
"Sign," "signal," or "mark."
Here, 'sinal' denotes a gesture or sign made with the hand.
Ela fez um sinal com a mão para chamar atenção.
She made a hand signal to attract attention.
In this sentence, 'sinal' refers to a transmission or reception signal, specifically for internet connectivity.
O sinal de internet está fraco nesta área.
The internet signal is weak in this area.
In this context, 'sinal' refers to a bell or auditory signal used in schools.