What exactly does SKU stand for again?

In the world of Microsoft O365 licenses, you hear very often the term “SKU“. There are O365 cloud service products that are described as “SKU“, you get license information with PowerShell commands with “SKU-something” in the name, they have “SKU IDs” or “Account SKU IDs“… …what appears here as “SKU Partnumber” appears elsewhere as “Product […]