A domain passes the test if a listener can hear it once and type it correctly into a browser without needing a visual prompt.
To pass the radio test, avoid using hyphens, numbers (which can be spelled out or written as digits), and complex or non-standard spellings. Domain Acquisition Strategies
Many audio-centric sites use country-code TLDs (ccTLDs) like .fm (Micronesia) or .am (Armenia) because they match traditional broadcast bands.
Radio stations, individual programs, podcasters, and amateur radio enthusiasts.
In general web marketing, the is a benchmark for how easily a domain name can be understood and spelled correctly after being heard.
You can purchase these domains through various services such as: OnlyDomains : Offers registration and renewal services.