Emphasis and Symbols
There are many elements that you can use on parts of your text inside a paragraph, for example, you can make a word appear italicized by using the emphasis element, see Emphasis. These elements are inside a block element, and so are known collectively as "inline elements".
Normally, Inline Elements are added using the Element Context Menu, but there are exceptions like Emphasis (can be added in two ways) and Symbols and special characters (like @ and ©). Technically, these are not inline elements, but they are similar as you can include them inside a Block Elements such as a para
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Note
DocBook 5.1 has many other inline elements you can use in Paligo.