9-1-1 Definition

nīnwunwun
symbol
In the U.S., Canada, and some other countries, a three-digit telephone number that may be dialed in an emergency: it connects to a dispatcher who notifies the police, the fire department, or medical personnel as appropriate.
Webster's New World
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pronoun

(US, Canada) The telephone number used to call the police or other emergency services.

Wiktionary
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noun
By extension, an emergency phone call.
Wiktionary
By genericization, an emergency.
Wiktionary
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Origin of 9-1-1

  • When the 9-1-1 system was originally introduced, it was advertised as the "nine-eleven" service. The advertising was changed when concerns were expressed that some types of callers, most notably smaller children, tend to be very literal, and might waste emergency response time trying to find a non-existent "eleven" key on their telephones. Therefore, all references to the telephone number 9-1-1 are now always made as "nine-one-one", and never as "nine-eleven", according to standards outlined by the National Emergency Number Association (NENA). Some newspapers and other media require that references to the phone number be formatted as 9-1-1, also a suggested standard by NENA.

    From Wiktionary