buzz·er

[buhz-er]
noun
1.
a person or thing that buzzes.
2.
a signaling apparatus similar to an electric bell but without hammer or gong, producing a buzzing sound by the vibration of an armature.

Origin:
1600–10; buzz1 + -er1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
buzzer (ˈbʌzə) [Click for IPA pronunciation guide]
 
n
1.  a person or thing that buzzes
2.  a device that produces a buzzing sound, esp one similar to an electric bell without a hammer or gong
3.  (NZ) a wood planing machine

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
buzzer is always a great word to know.
So is interrobang. Does it mean:
the offspring of a zebra and a donkey.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
Etymonline
Word Origin & History

buzzer
c.1600, "buzzing insect," agent noun from buzz. Of mechanical devices, from 1870 (steam-powered at first; electric mechanisms so called from 1884).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
For this event, the candidate uses the sledgehammer to strike a measuring
  device in a target area until the buzzer activates.
The offeror will provide all questions, buzzer systems, materials and supplies
  needed for the event.
It was a sight to behold, this copper without a buzzer taking the law in his
  own hands.
By the final buzzer, it went down as a reality check.
Synonym Game
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