"Physical cues" refers to signals or signs that can be observed or sensed through the body or physical actions. These cues help convey emotions, reactions, or messages without using words. Full definition
Further, departure time and routes of travel were correlated with physical cues such as magnetic inclination, moon phase, and gravitational signals. (science.sciencemag.org)
There's actually a range of subtle physical cues that show she's into you. (elitesingles.com)