Radio test, explained
Names fail it through homophones such as to, two and too, numbers that could be digits or words, dropped vowels as in Flickr, unusual spellings, plurals, hyphens, and doubled letters where two words meet. The quick version: say the name to a few people and ask them to type it. If most of them type it the way you registered it, it passes.
For an investor, passing the radio test widens the buyer pool, because brands want customers to find them from word of mouth, podcasts and audio ads. A name that fails it leaks visitors and email to whoever owns the obvious spelling, so its buyer often has to acquire that spelling too. The test is a filter, not a verdict: some strong brands fail it and succeed through heavy marketing, but an end user paying a premium usually wants a name that needs no spelling out.
Voice assistants and AI agents that take spoken requests apply the same test at scale: speech-to-text tends to return the most common spelling, so a name that fails with people usually fails with machines too.
Example. Hearing a name built on the word 'for', listeners split between 'for', 'four' and the digit 4, so the name fails the radio test.
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