Indicator

Indicator may refer to:

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

In biology:

• Indicator (genus), a genus of birds in the honeyguide family
• Environmental indicator of environmental health (pressures, conditions and responses)
• Ecological indicator of ecosystem health (ecological processes)

In economics:

• Technical indicator, a tool used in the technical analysis of financial securities
• Economic indicator or business performance indicator

In mathematics, engineering, and industry:

• Indicator function of a subset of the domain, a concept in mathematics
• Indicator (distance amplifying instrument), any of various instruments used to accurately measure small distances, and amplify them to make them more obvious
• Indicator diagram, a graph of pressure against stroke within a piston engine

In society:

• A synonym for the turn signal of an automobile