The critical thinking skill being used when the nurse applies knowledge and experience to client care is called "application." This skill involves the ability to use one's understanding of a particular situation or concept to solve problems or make decisions in a practical context. In nursing, the application of knowledge and experience to client care requires a nurse to draw on their education, training, and clinical experience to identify and implement the most effective interventions for their patients. This involves not only understanding the underlying principles of client care, but also being able to assess the unique needs and circumstances of individual patients and adapt one's approach accordingly.