Three characters, .org, X-for-Y. E4R reads as energy for resilience, evidence for reform, or education for refugees.
Education for refugees is a substantial and permanently funded area of humanitarian work, with UN agencies, major NGOs, and dedicated foundations operating in it. A short name stating that mission would be read correctly across the entire sector.
Evidence for reform is the language of policy advocacy, used by think tanks and research organisations pushing for institutional change.
Energy for resilience fits the growing overlap between energy access and disaster preparedness, an area drawing climate adaptation funding.
Each of these is a real institutional niche with .org buyers, and the 4-as-for convention means the name reads as a statement of purpose rather than as three letters requiring a glossary.
Three characters, fixed supply. The name is listed.
Enquiries welcome.