The term MONOGRAM OF DUKE ELLINGTON can be solved by the three letter answer EKE. This is a reference to the American jazz composer, pianist, and bandleader Duke Ellington (1899-1974). Ellington was one of the most influential figures in jazz music and his compositions spanned a wide range of styles from big band swing to modern jazz. His monogram, EKE, was used as a logo on many of his albums and other works.