Three characters, .org, X-for-Y. T4I reads as technology for inclusion, training for impact, or tools for innovation.
Technology for inclusion is a well-funded area: digital accessibility, assistive technology, and the work of getting people online who aren’t. Foundations, disability organisations, and public programmes all operate there, and they name things exactly this way.
Training for impact is standard capacity-building language in the development sector.
The reason the 4-as-for convention works is that it gives the reader a verb-less sentence to complete. That’s an active mental operation, and things you actively process stick better than things you passively read. It’s why programme names in this shape survive in institutional memory while longer ones get abbreviated into something nobody chose.
Three characters, fixed supply, and the extension that matches the buyer.
The name is available. Offers welcome.