You can use butterfly design @LordGood   https://books.google.com.ar/books?id=dntoT_MdGWsC&pg=PA153&lpg=PA153&dq=mesoamerican+shields+-aztec&source=bl&ots=LXoayRW38c&sig=zMCI1lydEa7kycaP8SqYctLboq4&hl=es-419&sa=X&ved=0ahUKEwjB4sijj5DRAhXBJCYKHaISDMcQ6AEIJjAE#v=onepage&q=mesoamerican shields -aztec&f=false