Source Nonprinting Formatting Marks In Word
What Do The Formatting Marks Mean In Word 2010?

will be displayed if you press Enter to insert a paragraph break (start a new paragraph).
will be displayed if you press Shift+Enter to insert a Line Break (start a new line).
Source Line, page and section breaks
Insert a Line Break
There are two types of line breaks: a paragraph (hard) break and a
manual (soft) break.
You insert a paragraph break by pressing Enter. The new
paragraph applies all the related styles, for example, the spacing
between paragraphs or creates a new bullet or numbered item in a list
Suppose you want to omit the extra space between paragraphs because
you are entering an address, writing a poem or suppose you require a
line break in a list without adding a new item. To do this you insert
a manual break.
You do this by placing the cursor where you want to insert the line
break and then press Shift+Enter
How can I change the paragraph marks?
You cannot change which symbol is displayed. However you can delete the paragraph mark or line break and use the other one if it meets your formatting need better.