Indicator may mean: Indicator (genus), a genus of birds in the honeyguide family In chemistry: pH indicator, a chemical detector for protons in acid-base titrations Redox indicator, a chemical detector for redox titrations Complexometric indicator, a chemical detector for metal ions in complexometric titrations Zeta potential, a property of interfaces in fluids for Zeta potential titration Dial indicator, an instrument that measures small distances Economic indicator or business indicato… (More on Indicator)