X9
X9 may refer to:
- X9 (New York City bus)
- X9, a Metrobus route
- X-9 Shrike, a missile
- ASC X9, the ANSI Accredited Standards Committee X9 (ASC X9)
- Khors Aircompany, former IATA code
- Former IATA code for WOW air
- Secret Agent X-9, a comic strip (1934–1996) created by Dashiell Hammett
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