r4t.org
Medical research charities number in the thousands, all competing for attention with names that tend to be long and similar. Three characters is a real differentiator in that crowd, and research for treatment reads straight off them.
R4T also carries resources for teachers, covering a substantial category served by nonprofits, unions and public bodies, and rights for tenants, with housing advocacy organisations active in every major city and growing political salience behind the work.
Each of those audiences reads the 4-as-for convention fluently, because it has become the sector’s house style.
Fixed supply, established convention, and the extension matching the buyer exactly.
The name is available. Enquiries welcome.