Indicator may refer to:

Biology

Environmental indicator Environmental indicators are simple measures that tell us what is happening in the Natural environment, environment. Since the environment is very complex, indicators provide a more practical and economical way to track the state of the environment ...

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 *

Honeyguide Honeyguides (family (biology), family Indicatoridae) are a family of birds in the order Piciformes. They are also known as indicator birds, or honey birds, although the latter term is also used more narrowly to refer to species of the genus ''Pro ...

s, also known as "indicator birds", a family of Old World tropical birds ** ''Indicator'' (genus), a genus of birds in the honeyguide family *

Indicator species A bioindicator is any species (an indicator species) or group of species whose function, population, or status can reveal the qualitative status of the environment. The most common indicator species are animals. For example, copepods and other sma ...

, 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 Indicator organisms are used as a proxy to monitor conditions in a particular environment, ecosystem, area, habitat, or consumer product. Certain bacteria, fungi and helminth eggs are being used for various purposes. Types Indicator bacteria ...

, 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 * Iodine–starch test, a method to test for the presence of starch or iodine.

Chemistry

* Complexometric indicator, a chemical detector for metal ions in complexometric titrations. * Humidity indicator card, a card impregnated with chemicals that change colour when a particular humidity is exceeded. *

pH indicator A pH indicator is a halochromism, halochromic chemical compound added in small amounts to a Solution (chemistry), solution so the pH (acidity or Base (chemistry), basicity) of the solution can be determined visually or spectroscopically by chang ...

, a chemical detector for protons in acid-base titrations. *

Redox indicator A redox indicator (also called an oxidation-reduction indicator) is an indicator which undergoes a definite color change at a specific electrode potential. The requirement for fast and reversible color change means that the oxidation-reduction Ch ...

, a chemical detector for redox titrations. * Zeta potential, a property of interfaces in fluids for Zeta potential titration.

Economics

Economic indicator An economic indicator is a statistic about an Economics, economic activity. Economic indicators allow analysis of economic performance and predictions of future performance. One application of economic indicators is the study of business cycles. ...

Macroeconomic indicators Macroeconomic indicators are aggregated statistics for a geography, population, or political jurisdiction gathered by agencies and bureaus of various government statistical organization, and sometimes by private organizations using similar techniqu ...

, economic indicators provided by agencies and bureaus of various government statistical organizations and sometimes by private organizations * Performance indicator * Technical indicator, a tool used in the technical analysis of financial securities

Mathematics, engineering, and industry

* Indicator (distance amplifying instrument), any of various instruments used to accurately measure small distances, and amplify them to make them more obvious * Indicator (metadata), a Boolean value that may contain only the values true or false and includes the meaning of these values *

Indicator (statistics) In statistics and research design, an indicator is an observed value of a variable, or in other words "a sign of a presence or absence of the concept being studied". Just like each color indicates in a traffic lights the change in the movement. F ...

, a concept in statistics, research design and social sciences *

Indicator diagram An indicator diagram is a chart used to measure the thermal, or cylinder, performance of Reciprocating engine, reciprocating steam and Internal combustion engine, internal combustion engines and compressors. An indicator chart records the press ...

, a graph of pressure against stroke within a piston engine *

Indicator function In mathematics, an indicator function or a characteristic function of a subset of a set is a function that maps elements of the subset to one, and all other elements to zero. That is, if is a subset of some set , then the indicator functio ...

of a subset of the domain, a concept in mathematics *

Indicator net Constructed using light steel nets, indicator nets were often anchored at various depths to the sea bed around Allied naval bases during both world wars. They were intended to entangle U-boat traffic of the enemy, even though the submarines often ...

, 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 Indicator of compromise (IoC) in computer forensics is an artifact observed on a network or in an operating system that, with high confidence, indicates a computer intrusion. Types of indication Typical IoCs are virus signatures and IP addre ...

, an artifact observed in computer forensics that indicates an intrusion

Other uses

* ''Indicator'' (Deine Lakaien album), 2010 * ''Indicator'' (Onward to Olympas album), 2012 *

Indicator Island Galindez Island () is an island long, lying immediately east of Winter Island in the Argentine Islands, Wilhelm Archipelago, Antarctica. It is home to the Vernadsky Research Base. Location The Argentine Islands are off the Graham Coast ...

, in the Argentine Islands of Antarctica * ''The Indicator'' (1819–1821), a weekly literary journal edited by

Leigh Hunt James Henry Leigh Hunt (19 October 178428 August 1859), best known as Leigh Hunt, was an English critic, essayist and poet. Hunt co-founded '' The Examiner'', a leading intellectual journal expounding radical principles. He was the centre ...

* ''The Indicator'', a daily podcast produced by Planet Money * A synonym for the

turn signal Automotive lighting is functional exterior lighting in vehicles. A motor vehicle has lighting and signaling devices mounted to or integrated into its front, rear, sides, and, in some cases, top. Various devices have the dual function of illumin ...

of an automobile {{disambiguation