QLF stands for:
- Quadratic solution formula (s ) for solving quadratic equations, see Quadratic Equation # solution formulas
- E training fund agriculture and forestry in Schleswig -Holstein V.
- Quantitative light-induced fluorescence (English Quantitative Light -induced Fluorescence ) in dentistry
- Quick Lock Formula with coaxial connectors for high frequency applications, see coaxial connector for high frequency applications # QN / FQLF / FQMA