Asian societies, particularly China, Hong Kong, Taiwan, Thailand, Malaysia, Brunei, and of course Singapore, have a strong fascination with numbers—I surmise it’s because these societies are generally more superstitious. This fascination translates to a higher demand for banknotes with certain types of numbers, driving up their value. In Singapore, collectors seek four types of numbers: golden, auspicious, aesthetic, and complementary numbers. A fifth type—a catch-all category referred to generally as “fancy” numbers—may also fetch slightly more value compared to their mainstream counterparts.