What is VISUAL INDICATION What is CHEMICAL INDICATION
What is PHYSICAL INDICATION
What is BIOLOGICAL INDICATION
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1) visual indication -- Visual indicators are one such example. A visual indicator is a “marker” that helps users quickly locate an item that has an important distinctive attribute within a list of otherwise similar objects

2) chemical indication -- A chemical indicator is a substance that undergoes a distinct observable change when conditions in its solution change. This could be a color change, precipitate formation, bubble formation, temperature change, or other measurable quality.

3) PHYSICAL INDICATION -- an indication of bodily condition that can be directly perceived (as by auscultation) by an examining physician.

4) BIOLOGICAL INDICATION -- Bioindicators are species, groups of species or biological communities whose presence, abundance and biological conditions, in real ecosystems or through the use of laboratory toxicity tests, to make inferences about the quality of the environment.

Explanation:

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For example - phenolphthalein is a colourless indicator which remains colourless in acidic medium, but turns pink upon addition of a base.

For example - methyl yellow, which imparts a yellow colour to an alkaline solution.

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