1-9 may refer to: * 0s, the first "decade" of the AD/CE time system (AD 1–9) *

1% rule (Internet culture) In Internet culture, the 1% rule is a general rule of thumb pertaining to participation in an internet community, stating that only 1% of the users of a website actively create new content, while the other 99% of the participants only lurk. V ...

, also known as the ''1–9–90 rule'' *Two services of the New York City Subway which formerly ran together **

1 (New York City Subway service) The 1 Broadway–Seventh Avenue Local is a rapid transit service in the A Division of the New York City Subway. Its route emblem, or "bullet", is colored , since it uses the IRT Broadway–Seventh Avenue Line for its entire route. The 1 oper ...

9 (New York City Subway service) The 9 Broadway–Seventh Avenue Local was a rapid transit service in the A Division of the New York City Subway. Its route emblem, or "bullet", was colored , since it used the Interborough Rapid Transit Company (IRT)'s Broadway–Seventh Av ...

* U.S. Route 1/9 concurrency in northern New Jersey *

Emergency telephone number Most public switched telephone networks have a single emergency telephone number (sometimes known as the universal emergency telephone number or the emergency services number) that allows a caller to contact local emergency services for assis ...

for city police in Morocco

See also