Editing Indicator (section)

== Biology ==
* [[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
* [[Honeyguide]]s, also known as "indicator birds", a family of Old World tropical birds 
** [[Indicator (genus)|''Indicator'' (genus)]], a genus of birds in the honeyguide family
* [[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
* [[Iodine–starch test]], a method to test for the presence of starch or iodine.