Well, co-op is short for co-operative as in any joint work effort.  It is also used in the names of businesses that have a shared ownership/employee structure.

The other meaning of 'coop' is a small building, as in a chicken coop. 

There is also the phrase 'to be cooped-up' as in being trapped in a small space for a long time.  "When I broke my leg I was cooped-up in bed for a week during skiing season."

Don't confuse 'coop' with the English pronunciation and use of the French word 'coupe' which is an old style of car.

Hope this helps.

http://en.wikipedia.org/wiki/Farm_co-op

<a href="http://www.fccoop.com/">http://www.fccoop.com/</a>;

https://www.farmers.coop/

To Will,
yeah sometime it's make me confused to search some of literatures of coop. Thanks a lot.

To Bruce,
That site so really help me, thanks for your information.

not coup but coop or cooperative or union or small medium enterprises.

You mean coup?