For the Scottish river see: Urr Water
urea | National Disaster Risk Reduction and Management Council | golden ratio | Urea | Golden ratio | aspect ratio | Violent Crime Reduction Act 2006 | National Disaster Risk Reduction and Management Council (NDRRMC) | Toxics use reduction | Strategic Arms Reduction Treaty | Signal-to-noise ratio | Sharpe ratio | Risk reduction | Reduction potential | Receivables turnover ratio | Ratio Institute | ratio | PTAS reduction | Poverty reduction | Polynomial-time reduction | MRC (Maximum Ratio Combining) | Monetae cudendae ratio | Maximal-ratio combining | LSZ reduction formula | Loan-to-value ratio | Lenstra–Lenstra–Lovász lattice basis reduction algorithm | Integration by reduction formulae | human sex ratio | Human error assessment and reduction technique | Gear ratio |