White Phosphorus Bomb
White phosphorus (WP) is a flare- and smoke-producing incendiary device or smoke-screening agent that is made from a common allotrope of the chemical element phosphorus. White phosphorus bombs and shells are incendiary weapons, but can also be used as offensive anti-personnel flame compounds capable of causing serious burns or death. The agent is used in bombs, artillery, and mortars, short-range missiles which burst into burning flakes of phosphorus upon impact. White phosphorus is commonly referred to in military jargon as "WP". The slang term "Willy(ie) Pete" or "Willy(ie) Peter", dating from World War I and common at least through the Vietnam War, is still occasionally heard.