e4g.org
All three readings sit squarely in the .org world and all three would be read correctly by the relevant audience without explanation. That inherited legibility is the real value of an established convention.
E4G reads as education for girls, one of the most heavily funded causes in international development with dedicated programmes at every major foundation and multilateral. It reads as energy for growth, standing language in development economics among the institutes working on electrification and industrial capacity. And it reads as evidence for government, fitting the what-works movement producing research designed for policymakers.
Three characters, fixed inventory, and an extension signalling the right kind of organisation before anyone reads a word of the site.
The name is listed. Enquiries welcome.