What are Pirate metrics?
Pirate metrics are a set of metrics can describe the performance of a product across the marketing funnel. They are called Pirate metrics, as the acronym AAARRR sounds a bit like "aargh", i.e. something a pirate would say. There exact letters vary, but the use of Awareness-Acquisition-Activation-Retention-Revenue-Referral is common.
Pirate metrics are a set of metrics used in the evaluation part of the product management process.