How Shared Core A0 Virtual Machines Affect Subscription Limits

Q: How do A0 virtual machine sizes count toward my Azure subscription limits?

A: Azure subscriptions have limits on various resources, including the number of cores. An A0 is only a partial core; however, for Azure limits, an A0 still counts as a complete core. This is confirmed on the Azure Subscription and Service Limits page: "Extra Small instances count as one core towards the core limit despite using a partial core."