3-1-1

See also: 311, 3/11, and 3-11

English

Proper noun

3-1-1

1. (US, colloquial) A restriction on air travel in the United States, such that passengers may carry liquids on board as long as they are in 3.4-ounce containers that fit in a single 1-quart bag.
   • 2025 July 8, Pete Muntean and Alexandra Skores, “TSA will no longer require all passengers to take shoes off at airport security checkpoints”, in CNN‎^[1]:

     The requirement for passengers to take their shoes off at TSA security checkpoints came nearly five years later due to “intelligence pointing to a continuing threat,” an official TSA history notes, following a foiled August 2006 terrorist plot to detonate liquid explosives onboard transatlantic flights. The TSA introduced its 3-1-1 liquids rule for carry-on luggage in response.

2. (Canada, US, telephony) Alternative form of 311.
   • 2015 January 16, Rick Paulas, “The Linguistics of Tragedy”, in Pacific Standard‎^[2], archived from the original on 22 April 2025:

     9-1-1 is a phone number everyone knows growing up; its mention is associated with fear and disaster. If you’re dialing 9-1-1, something’s wrong. Using it in conjunction with another terrible event, then, isn’t a huge leap. If the events took place on March 11 (like the public information phone number 3-1-1), perhaps the metonym wouldn’t be “3/11,” since it isn’t similarly visceral. (It’s worth noting that the Madrid train bombings, which took place on March 11, are known in Spain as “11-M” due to the country’s use of the date-before-month method of date formatting.)
     (This connection between “9/11” and 9-1-1 is made evident in the story of its initial usage.

French

Proper noun

3-1-1 m

1. (Canada, US, telephony) alternative form of 311

Spanish

Proper noun

3-1-1 ?

1. (US, Dominican Republic, telephony) alternative form of 311