A MAP LEGEND is a KEY or set of symbols used to explain the meaning of symbols on a MAP. It is an essential part of any MAP, as it helps the reader understand the information presented. The term 'MAP LEGEND' is composed of three words: MAP, KEY, and LEGEND. The word 'MAP' refers to a representation of a geographical area, while 'KEY' is a three-letter word that means a guide or explanation. Finally, 'LEGEND' is a noun that refers to a traditional story or narrative. Together, these three words form the term 'MAP LEGEND, ' which describes a KEY or set of symbols used to explain the meaning of symbols on a MAP.