hexadecimal number system: a positional system of numeration that uses hexadecimal digits and a radix of sixteen
positional notation: a numeration system in which a real number is represented by an ordered set of characters where the value of a character depends on its position
jumping orchid: orchid having both male and female flowers in the same raceme; when a sensitive projection at the base of the column of the male flower is touched the pollen is suddenly ejected