1crest 
/ˈkrɛst/ noun
plural crests /ˈkrɛst/ noun [count] 1 : the highest part or point of something (such as a hill or wave)
▪ wave crests — usually + of ▪ The boat rose up on the crest of the wave. ▪ We stood on the crest of the hill/mountain. ▪ the crest of the flood — often used figuratively ▪ They're still riding the crest of the wave of their success. [=they are still very happy, excited, etc., because of their success] ▪ He was at the crest of his fame when he died tragically. 2 : a group of decorative feathers at the top of a bird's head ; also : a decorative bunch of hair on the head of another animal 3 : a special symbol used especially in the past to represent a family, group, or organization
▪ her family's crest — compare coat of arms
▪ wave crests — usually + of ▪ The boat rose up on the crest of the wave. ▪ We stood on the crest of the hill/mountain. ▪ the crest of the flood — often used figuratively ▪ They're still riding the crest of the wave of their success. [=they are still very happy, excited, etc., because of their success] ▪ He was at the crest of his fame when he died tragically.
▪ her family's crest — compare coat of arms
