What is the meaning of Indicator in bengali?

Meaning(s):

1. a number or ratio (a value on a scale of measurement) derived from a series of observed facts
2. can reveal relative changes as a function of time
3. a signal for attracting attention
4. a device for showing the operating condition of some system
5. (chemistry) a substance that changes color to indicate the presence of some ion or substance
6. can be used to indicate the completion of a chemical reaction or (in medicine) to test for a particular reaction
7. संकेतक Commodity prices can be a useful indicator of inflation, he claimed.
8. सूचक The car has an overhead console with a compass and outside temperature indicator.