Net Retention is another commonly used term for Net Revenue Retention (NRR). It measures the percentage of revenue retained from existing customers over a 12-month period, including both churn and expansion. The terms are used interchangeably, though 'Net Revenue Retention' is the more precise and commonly accepted term in SaaS finance and investor reporting contexts. Both measure the same thing: whether your existing customer base is growing or shrinking as a revenue pool.