From Design Shack: Not everything is as easy as ABC or 123. Sometimes your copy might require a character outside of the basic alphabet. That’s where special characters and glyphs come in. Look around, they are more common than you might think at first.
Depending on your workflow, inserting a glyph can be as simple as a keystroke or a multi-step process. Much of it depends on the software you are using, typography palette and how the final product will be published.