NRR
Net Revenue Retention. How much existing customers' spending grows or shrinks, ignoring new sales. Over 100% means the base grows by itself — the closest thing to a perpetual-motion machine finance accepts.
Heard in the wild
“120% NRR means the business grows even if sales signs nobody new.”
Tone check: Technical
Sophisticated investors read NRR before anything else. It's the truth serum of SaaS metrics.