presentation timer

A/V. Also known as "presenter timer," "speaker timer," or "countdown clock," a clock on the lecturn or near a confidence monitor, to indicate to the presenter know much time he has remaining for his speech. Besides a digital display, may also include (or just be) a traffic light-like array of green (talk), yellow (sum-up), and red (stop) indicators.

Originally a hardware solution:
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Today, software (that often works with PowerPoint or Keynote) is becoming popular.


See also the thread http://www.controlbooth.com/forums/...-free-presenter-countdown-timer-software.html .