"Has type" is a predefined property that describes the datatype of a property and is provided by Semantic MediaWiki. This property is pre-deployed (also known as special property) and comes with additional administrative privileges but can be used just like any other user-defined property.
Has type indicates of which type a semantic property is.
This property is a special property in this wiki.
For more info, see Semantic Mediawiki Help:Special property Has type.