indicator
noun
[ ˈɪndɪkeɪtə ]
• a thing that indicates the state or level of something.
• "car ownership is frequently used as an indicator of affluence"
Similar:
measure,
gauge,
barometer,
index,
mark,
sign,
signal,
guide to,
standard,
touchstone,
yardstick,
benchmark,
criterion,
point of reference,
guideline,
test,
litmus test,
• a gauge or meter of a specified kind.
• "a speed indicator"
• a compound that changes colour at a specific pH value or in the presence of a particular substance, and can be used to monitor acidity, alkalinity, or the progress of a reaction.
• "the remaining alkali is titrated against standard acid using phenolphthalein as indicator"
