A few months ago we overhauled how we organized our Categories (formerly Industries) to follow the SIC classification standard. We promised to provide a listing and are finally doing so. This classification applies to the categories in Stream, Discovery Filters, and Conditional Alerts.
You can use this to help get better feel for which categories you want to filter or verify which Category your company resides.
Here is the snapshot as of May 5th, 2022.