Additionally you can pass a second parameter which defines the format of the output. Valid options are:
name - Returns the full name, unlinked, non-italicized. (Default)
link - Returns the full name, linked and italicized.
short - Returns the linked prefix/tag/short name of the game.
If the first parameter - the abbreviation - is not present, it will show an error. If it isn't valid, or it doesn't resolve, nothing will be shown.
Note that some DLC's do not have a short prefix, usually because they have none or very few items. Base games are never prefixed.