It is a conventional symbol.
The purpose of the concluding sentence in a paragraph is to catch the reader's eye only. So yes
Answer:
Line length
Explanation:
Graphical elements in poetry are elements that help form the physical "shape" of the poem.
Other examples of these elements include capitalization and punctuation.
Therefore given these answer choices, an example of a graphical element found in poetry would be line length.
Type of definition in which a new or currently-existing term is given a specific meaning for the purposes of argument or discussion in a given context.