Case Title
Case Title is a text field that sites can use for any descriptive text about a case.
It's advantage over any other text field is that it can be included in the (often red) Search menu.
See the settings on the Admin > Top Level Navigation page (Search tab on that page): "Show Case Title in Search Menu" and "Show Case Title in Static Lists".
Whether Case Title is used, and where it can be edited, is determined by site administrators.
Similar Feature: Cause Number