ONOMATOPOEIA (%_%)

Definition:

     Used to describe words that look like the sound they are describing

Example:

     ... the moan of doves in immemorial elms,
     And murmuring of innumerable bees.

Significane:
     Because it helps the reader to easy to guess what the word mean just by reading it. The word can pop into their head and bring the emotion of the word so they can understand how it so effective.