Today, most wouldn't know how to use the "universal" triangular bandage as it was most commonly used 50 years ago. I remember having to learn how to tie a triangular head bandage, and if the instructor was able to lift it off the head of the patient, you got to learn it all over again. I learned to be a master of the triangular bandage. However, not having to use this knowledge in a very long time, I doubt that I remember much of what I learned 50 years ago...
Paul