Three characters, .net, X-to-Y. R2T reads as research to tool, retail to trade, or road to terminal.
Road to terminal is standard intermodal logistics language, describing the leg between a haulier and a port or rail terminal. Drayage and first-mile operations are a real and badly digitised part of freight, with genuine room for better software.
Retail to trade fits any business bridging consumer and professional markets, which is a common model in tools, building supplies, and equipment.
Research to tool describes the commercialisation path for technical work, suiting a product studio or a technology transfer operation.
Whatever the reading, three characters on a major extension is the constraint that drives this market. New companies keep forming, the inventory at this length does not grow, and the .net keeps it reachable for a technical or logistics business where the extension costs nothing.
The name is listed. Offers considered.