Icon template is a template that allows you to add emoji-like icons that can be used in the middle of text, just like that .
Full list of officially supported icons by this template can be seen below. You can copy their code and paste wherever you need.
Please keep in mind that using too many the same icons in one article is not recommended and should not be done as it may make the article hard to read and destroy its look.
Feel free to add more icons. If you don't know how to do so, you can ask someone else to do it via template discussion page