With D365 Icons and Tooltips you (Salesperson, Sales manager, Customizers, Administrator,...) can:

Easy to use the add-on.
Easy define icons and tooltips for each view, DON'T need to know JavaScript. (Please reference this link: https://docs.microsoft.com/en-us/powerapps/maker/data-platform/display-custom-icons-instead for more detail what we can do with this App)
Included some icons collection.
You can install more icons collection with a separator solution.
You can create your own icons collection.
Control which users can use D365 Icons and Tooltips.
Dynamics 365 supported customize.
Define once, can view on: Web Desktop, Unified Client Interface, Unified Service Desk, Dynamics 365 App for Outlook.