'indicator' originates from Latin, specifically the word 'indicātor,' where 'indicare' meant 'to point out or show.'

'indicātor' transformed into the French word 'indicateur,' and eventually became the modern English word 'indicator' through Middle English.

Initially, it meant 'one who points out or shows,' but over time it evolved into its current meaning of 'a device or sign that shows the state or level of something.'