Proprioception
Etymology
Coined by the physiologist Charles Sherrington in the early 1900s, from Latin "proprius" (one’s own) and the "-ception" of "perception." It literally means "perception of one’s own [body]." It named a sense that classical lists of the five senses had entirely omitted.
noun · /proh-pree-oh-SEP-shun/
The body’s sense of the position and movement of its own parts, without needing to look.
What it names
The "sixth sense" that lets you touch your nose with eyes closed or walk without watching your feet — a useful concept for anything involving balance, skilled movement, or its loss after injury.
Example
After the ankle surgery her proprioception was so scrambled she had to relearn how to stand on one leg.
Related idea
Paired with interoception (sensing internal organ states), proprioception handles the musculoskeletal map of where you are in space; together they form the felt sense of having a body at all.