Pink triangle and the LGBT rights movement. In Nazi concentration camps, each prisoner was required to wear a downward-pointing, equilateral triangular cloth badge on their chest, the color of which identified the reason for their imprisonment. Early on, homosexual male prisoners were variously identified with a green triangle (indicating criminals) or red triangle (political prisoners), the number "175" (referring to Paragraph 175, the section of the German penal code criminalizing homosexual activity), or the letter "A" (which stood for "Arschficker", literally "ass fucker"). Later, the use of a pink triangle was established for prisoners identified as homosexual men, which also included bisexual
Caduceus as a symbol of medicine popularised the caduceus, whilst retaining the caduceus for its own plaque and insignia, is now part of the Army Medical Department, which has since adopted the Rod of Asclepius as its main symbol. Furthermore, when the U.S. Air Force designed new medical insignia, it also adopted the rod of Asclepius. (The Royal Air Force (UK) medical services have, however, used the caduceus as uniform collar insignia since the foundation of the RAF in 1918.) Despite widespread acceptance of the caduceus as a medical symbol in the United States, it has been observed that the rod of Asclepius has "the more