One of the greatest challenges for the developing brain is to coordinate visual signals from one side to the other. (healthychildren.org)
Job one, then, for guardians, is to become brilliant at interpreting visual signals of discomfort in their dog, and learning to act on them immediately. (vanecovillage.com)
While plenty of teams still use heavily verbal play calls, others use numbers, and many use visual signals like hand signs or images. (sbnation.com)