Streams plugin is an example. Another example is Health tracker plugin (buff & debuff tracker) as a layout (mini fullscreen app), it will create new tiddler with random title, and ask user to input a caption. So two illness record can have same caption (you may get a illness 2 times)
This kind of tiddler with random generated title is “titleless tiddler”. I just hope there can be a standard way to represent it, for example, use a system namespace for them.