The view template title cascade is a cascade used by the default view template to choose the template for displaying the tiddler title.

The core view template title cascade can be found in $:/core/ui/ViewTemplate/title

The default view template title cascade consists of:

1. If the tiddler title starts with $:/ then use the template $:/core/ui/ViewTemplate/title/system which causes the $:/ prefix to be displayed in pale text
2. Otherwise, use the template $:/core/ui/ViewTemplate/title/default which displays the title in plain text

You can see the current settings for the view template title cascade in $:/ControlPanel under the Info -> Advanced -> Cascades -> View Template Title tab.