Onomatopoeia

onomatopoeia: onomatopoeia in language, the representation of a sound by an imitation thereof; e.g., the cat mews.  Poets often convey the meaning of a verse through its very sound. For example, in "Song of the Lotus-Eaters" Tennyson indicates the slow, sensuous, and langorous life of the Lotus-Eaters by the sound of the words he uses to describe the land in which they live

Example: In a comic book there a lot of  "boom ,pow"