Acupuncturists have extensive knowledge of the human body and study acupuncture or traditional Chinese medicine for years before getting a license. Since there are over 300 WHO standard acupuncture points on the human body, acupuncture and anatomy charts are indispensable in this practice. By combining acupuncture with aromatherapy, the treatment efficiency is increased, which is why acupuncturists may also have in their office an Aromatherapy Quick Reference Guide Chart that they can consult whenever needed. Besides a spinal nerves poster, a human anatomy chart, and a trigger point poster, other learning aids that are useful for acupuncturists and massage therapists include anatomical models, postural charts, and test preparation materials. The latter improves the memory of anatomical structures via flashcards and workbooks.