The term 'Burma Knife' refers to a traditional knife from Burma, now known as Myanmar. The term can be broken down into three crossword solutions: Siam (4 letters), Rangoon (7 letters), and SIGNS (5 letters). Siam is the former name of Thailand, which borders Myanmar. Rangoon is the former name of Yangon, the largest city in Myanmar. SIGNS refers to the distinctive markings on the blade of a Burma Knife.