Template:ArticleIcon

This is the "root" template for all article icons. It is not intended to be placed on pages directly, but rather to be used for building one template per each icon. For the list of all current such templates, see Special:PrefixIndex/Template:ArticleIcon.

The sort key must be unique amongst all icons and is sorted ASCII-betically. Therefore, the standard is to use half-numerical keys such as "010-name" and "225-banana", leveraging numbers to form a system of where things belong. No, we don't expect hundreds of different icons, we're using the hundreds digit to order different types of icons.
 * 000 - 099: game icons (what games is the subject in)
 * 100 - 199: page tag icons (what improvement tags are present on the page)
 * 200 - 299: page status icons (is the page protected, featured, etc)

Note how this template uses  instead of. This is because the sort key is not parsed as a parameter when the latter is used.