When using utf-8 encoding on web pages, it is sometimes easier to use special characters instead of graphics for standard functions such as “Delete,” “Add”, “Edit,” etc. For instance, I can use ✘ and style it red and most people will understand that as “Delete.” Most modern browsers can handle Unicode characters, so using them is generally not a problem. I say generally because sometimes you get the infamous diamond question mark where you expected to see your special character.
Still, it’s handy when you need it. Search for your favorites over at Fileformat.info.