The base-bs3\html\layouts\joomla\content\item_title.php file in the 2.5.5 release of the T3 Framework specifies an itemprop of "headline" for the article title when the more accurate itemprop would be "name".

For example, in an article that is named "Major Events on April 8", the headline might be "SpaceX Cargo Mission Successful!" along with other content. See the "Properties from Thing" section on https://schema.org/Article.