We sometimes "signal" interest in someone without the use of words, which is part of how we establish a relationship with another person, possibly a lasting one. how would an anthropologist describe our behavior?

kinesics

Explanation:

Kinesics are gestures and expressions that we make with our body in order to communicate non verbally for example facial expressions, smiling or winking.

We move any part of our body or we move all the body to communicate non verbally.

We may nod our head to show that we agree or raise our hands to signal that we want to say something or wink an eye all these are kinesics.

Our interest at someone may start by winking, smiling at them and moving closer to the person followed by extending our hands to touch them or hold their hands which may make someone feel something so the non verbal langauge can go a long way to show our interest on someone without using words.

c it has to be i googled it