999

999 or triple nine most often refers to:

• 999 (emergency telephone number), a telephone number for the emergency services in several countries
• 999 (number), an integer
• AD 999, a year
• 999 BC, a year

• 999 (anthology) or 999: Twenty-nine Original Tales of Horror and Suspense, a 1999 anthology of short stories
• Galaxy Express 999 , a manga and anime created by Leiji Matsumoto

• Triple 9 , a 2016 heist-thriller film
• 999 (British TV series), a British programme presented by Michael Buerk that aired on the BBC
• 999 (Malaysian TV series), a 2004 Malaysian crime reality television series
• 999: What's Your Emergency? , a 2012 British factual programme following the emergency service
• Triple Nine (TV series), a Singaporean television series running from 1995 to 1999

• 999 (band), a London punk rock band active since the 1970s
• 999 (album), a self-titled album by the band 999
• 999 (EP), an EP by Olamide
• 999 (MC Lars album), an album by MC Lars
• 999 (Selena Gomez and Camilo song)
• "999" (Kent song)
• "999", a song from Keith Richards' album Main Offender (1992)
• 999, a number often used by Juice WRLD

• 999: Nine Hours, Nine Persons, Nine Doors , a 2009 video game developed by Chunsoft

• Ducati 999, an Italian motorcycle
• New York Central and Hudson River Railroad No. 999, the first steam locomotive in the United States to operate at faster than 100 mph
• Ford 999, a pioneering 1902 racer named for the locomotive

• 999 Zachia, an asteroid
• 9–9–9 Plan, a tax plan proposed by 2012 Republican presidential candidate Herman Cain
• 999 phone charging myth, an urban myth that calling the emergency services charges mobile phones
• Nine (purity), an informal way of ranking purity; "three nines" would be 99.9% pure
• "Three nines" as a level of high availability (99.9%)
• Triple Nine Society, a society for people with IQs in the 99.9th percentile

• 0.999... for proofs that 0.999... is equal to 1

• Lists of ambiguous numbers

• Short description is different from Wikidata
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