Indicator

Indicator may refer to:

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)
Health indicator, which is used to describe the health of a population
Indicator species, a species that defines a characteristic of an environment
Indicator bacteria, bacteria used to detect and estimate the level of fecal contamination of water
Indicator organism, organisms used to measure such things as potential fecal contamination of environmental samples
Indicator plant, a plant that acts as a measure of environmental conditions
Indicator value, one of two terms in ecology referring to the classification of organisms

pH indicator, A weak acid or weak base whose colour is different from that of its conjugate base (Eng L Jay)
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
Humidity indicator card, a card impregnated with chemicals that change colour when a particular humidity is exceeded

Technical indicator, a tool used in the technical analysis of financial securities
Economic indicator
Performance indicator

Indicator (statistics), a concept in statistics, research design and social sciences
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
Indicator net, nets anchored at various depths to the sea bed around Allied naval bases during World War II intended to entangle U-boat traffic of the enemy
Indicator of compromise, an artifact observed in computer forensics that indicates an intrusion
Indicator (metadata), a Boolean value that may contain only the values true or false and includes the meaning of these values

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