When working in the Calculation window for Field Definitions, there is a list with the fields on the left. A symbol in front of it allows the developer to see what kind of field it is (Text, Number, Calculation, ...).
When you have a lot of calculation fields, it would be handy to have a "hover" that shows the calculation in the field.
It would allow to see what if we have the correct field, if we don't repeat something already available, which fields are referenced, ...
A big timesaver for developers, and new users would find it convenient to know what they reference to if they include it in their new calculation.
If fact, this could be used in a lot of places as it makes it unnecessary to open the "Manage database .." to check a calculation.