SEP

Sep or, as an acronym, SEP, can mean:

* September - the ninth month of the year in the Gregorian Calendar.
* Safety and Emergency Procedures - SEP is used in aviation industry by Flight Crew and Cabin Crew to define the procedures used in an emergency.
* The Saturday Evening Post
* SEP IRA - A type of retirement account in the USA.
* Secretaría de Educación Pública - the government department overseeing public education in Mexico.
* System Enhancement Package, an upgrade to the M1A2 Abrams main battle tank.
* Systems Engineering Process - used to develop, implement, and maintain complex systems.
* Sepa - the Heliopolitan manifestation of Osiris as a centipede.
* Single Edge Processor
* Signaling End Point - a term in telecommunications
* Somebody Else's Problem - a fictional cloaking device in "The Hitchhiker's Guide to the Galaxy", causing bystanders to disregard whatever was in the field as "somebody else's problem"
* Socialist Equality Party
* Sociedade Esportiva Palmeiras - a Brazilian football team.
* Specialna Enota Policije - a police unit in Slovenia.
* Standard electrode potential
* The Stanford Encyclopedia of Philosophy
* Stanford Exploration Program
* Society for Exact Philosophy
* Solar Electric Propulsion - see ion thruster
* Search engine prominence
* Sep-Se7en, a nickname of Minneapolis rapper Slug
* The Summer Enrichment Program for gifted and talented children in Greeley, Colorado
* Splitterskyddad Enhetsplattform, an armoured vehicle being developed by BAE Systems Hägglunds.
* Société Européenne de Propulsion
* "Super Extended Play" - a recording mode found on DVD recorders and digital video recorders
* Symantec Endpoint Protection"Sep." was used on maps to abbreviate Septentrional, the North direction or zone.