A four-digit numeric .net. Numeric domains are their own market with their own logic, and the main thing driving it is that numbers don’t need translating.
A four-digit string reads identically to a speaker of Mandarin, Arabic, Spanish, or English. No pronunciation problem, no accidental meaning, no spelling question. That universality is why numeric names have a durable following in international markets and why the short numeric sets have held up through cycles that flattened the keyword market.
Practically, four digits is a phone-number-length chunk that people are already good at remembering. It also suits any business that uses numeric identifiers naturally: a channel, a station, a model line, a route, a shortcode service.
The .net keeps it reachable while staying perfectly appropriate for a technical or service business. Nothing about a number requires a .com to make sense.
Four digits, no letters, nothing to spell, and a fixed global inventory.
Offers welcome.