Timer

A timer or countdown timer is a type of clock that starts from a specified time duration and stops upon reaching 00:00. It can also usually be stopped manually before the whole duration has elapsed. An example of a simple timer is an hourglass.

Commonly, a timer triggers an alarm when it ends.
A timer can be implemented through hardware or software.
Stopwatches operate in the opposite direction, upwards from 00:00, measuring elapsed time since a given time instant.

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Source: Wikipedia · Image: Wikimedia Commons · Public domain

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