counter
/ˈkaʊntə//ˈkaʊntɚ/noun
Definitions
One who counts
Example: He's only 16 months, but is already a good counter – he can count to 100.
A reckoner; someone who collects data by counting; an enumerator.
An object (now especially a small disc) used in counting or keeping count, or as a marker in games, etc.
Example: He rolled a six on the dice, so moved his counter forward six spaces.
A telltale; a contrivance attached to an engine, printing press, or other machine, for the purpose of counting the revolutions or the pulsations.