Nonverbal means not using words. It's communicating without speaking.
Nonverbal communication can include things like body language, facial expressions, and gestures.
Examples:
She used nonverbal signals to show she was happy.
Nonverbal communication is important too.
He's good at nonverbal communication.
The cat's nonverbal communication told me it was hungry.
In space, aliens might use nonverbal communication.
The nonverbal message was clear even though no one spoke.