Some people call it a "note", perhaps in reference to the short form for the term "banknote". If it is, then it is technically incorrect.
Before we get into the technical details, let's go back 70 years, Malaya was then under Japanese occupation since late 1941 / early 1942. By 1944/45 the tide was turning against the Japanese and toward the end of the war, sometime between 1944 and 1945, the Royal Air Force (British) started airdropping these pieces of paper as part of the psychological warfare initiative.
