The term "Five Eyes" officially refers to the intelligence alliance comprising the five nations Australia, Canada, New Zealand, the United Kingdom, and the United States. It's governed by the UKUSA Agreement, which goes back to WW2.
In the intelligence community, they abbreviate it FVEY. For instance, on a classified document, the marking "REL TO USA, AUS, GBR, CAN, NZL", meaning the information can be shared with those five countries, can be shortened to "REL TO FVEY".
“REL TO covfefe”